Take a look at all the different types of LED light fixtures on our website that utilize this type of T8 configuration and you’ll probably find something that will work great for you. T8 bulbs are 8/8 inch (a full inch, in other words), while T12 bulbs are 12/8 of an inch in diameter 1 1/2 inches. Compare; Find My Store. It’s a length of phosphor-coated tube that went powered on excites the phosphors which create visible light. All these bulbs can be used vice versa so long as they share the same bi-pin connections on the base (the 2 pins at the end of the tube) and have the right milliamp (power supply) requirements. This is h… Although T8 tubes are often employed to get better energy savings than the older style fluorescent tubes, the effect is basically the same as any other linear fluorescent. The diameter ofthe tube is described in eighths of an inch, as it is for incandescent lamps, soa fluorescent lamp 1 inch in diameter (eight eighths) is a T8. Lamps are typically identified by a code such as FxxTy, where F is for fluorescent, the first number (xx) indicates either the power in watts or length in inches, the T indicates that the shape of the bulb is tubular, and the last number (y) is the diameter in eighths of an inch (sometimes in millimeters, rounded-up to the nearest millimeter). The adoption of T8 lighting took some time because people not only had to just change a light bulb, but they had to change a ballast as well. That's not always the case as sometimes people changed their T12 ballast to be electronic years ago. 99 ($16.67/Count) $124.83 $124.83 [6] This first energy-saving tube design remains a T12 tube even today. In an effort to make LED tube lights compatible with the internal dimensions of most fixtures, you will find that most LED tube lights feature a T8 or 1 inch diameter. T12 bulbs are simply an older technology that arose back in the 1940’s which was a big step forward in lighting. The most common that we see is a fluorescent bent T8 with six-inch leg spacing. Call or email for special discount pricing. The T12 is 1.5 inches in diameter and the T8 is 1 inch in diameter. The Nominal Length may not exactly match any measured dimension of the tube. Running a T8 tube with a ballast for T12 will reduce lamp life and can increase energy consumption. T12. However, follow-on retrofit replacements for all the other original T12 tubes were T8, which helped with creating the required electrical characteristics and saving on the then new (and more expensive) polyphosphor/triphosphor coatings, and these were even more efficient. I hope that answers your question, let us know if there's anything else we can help you with. For example, if the last two digits on a lamp say 41, that lamp's color temperature will be 4100 K, which is a common tri-phosphor cool white fluorescent lamp. Color is usually indicated by WW for warm white, EW for enhanced (neutral) white, CW for cool white (the most common), and DW for the bluish daylight white. This section lists the more common tube ratings for general lighting. It was simply making the cheapest lamps possible for a marketplace that was exploding with the possibilities of fluorescent lighting. One primary difference between T8 and T12 fluorescent tubes is the size of the tubes and their bases. Sizes range fromT2 to T17. This spawned a whole new variety of fluorescent lighting that continues to be used to this day. Also, let us know if we can help you determine what might be the best way to go for more efficient lighting. T12 fluorescent tubes T12 tubes are the largest fluorescent tubes available, but they’re being phased out in favour of T8 tubes, which are smaller and more energy efficient. T8 tubes are simply 1 inch in diameter versus the 1.5 inch diameter of T12 tubes. While both bulbs come in standard lengths, commonly 4 feet, the designation of 8 or 12 refers to the difference in the diameter of the bulb. The fluorescent bulb's T-number in essence gives the bulb diameter and its connecting pin design. Another improvement that came along with T8 bulbs was an improved color rendition as well. A t12 ballast is a reference that essentially refers to the size of the tube of the florescent bulb that is being used. As we describe in our how to article, T8 and T12 feature the same G13 bi-pin connector. Bright White. The Story Behind This Account of Fluorescent Lamp Development", "Lawrence Berkeley National Laboratory: T-8 lamp retrofits", "Lawrence Berkeley National Laboratory: History and problems of T12 fluorescent lamps", https://en.wikipedia.org/w/index.php?title=Fluorescent-lamp_formats&oldid=995768139, Articles with unsourced statements from May 2010, Creative Commons Attribution-ShareAlike License, Slim lamps. One socket; anywattage. Some lamps have an internal opaque reflector. The T12 runs on a magnetic ballast and a T8 operates on an electronic ballast. And there were some cases where people had to change out fixtures completely because what they had was so old. A T12 lamp (on the left in the figure below) is therefore twelve-eighths of an inch, or one-and-one-half inches (3.81 cm), in diameter. An internal reflector is more efficient than standard external reflectors. ... Click to add item "Sylvania® 40W U-Bend Cool White T12 Fluorescent Light Bulb" to … 99 A 5-watt, 25-watt, or 300-watt incandescent bulb can be screwed into anEdison socket and they will all work as they are supposed to. LED tube lights work in the same sockets as the T8 and possibly the T12 depending on what you have, making them an obvious retrofit opportunity with a fast payback. A T8 has a one inch (8/8 inch) diameter, a T5 has a 5/8 inch diameter, and a T12 is a 12/8 inch (1.5 inch) in diameter. So the bottom line is that these are not interchangeable and if you're going to upgrade from a T12 to a T8 bulb, then you also have to change out the ballast. T12 tubes pull 40 watts, and are frequently being replaced with lower wattage t8 tubes, which operate on 32 watts. Soft White. Fluorescent tube shape. 30 Inch LED Tube - G13 T8 LED Lamp - 12 Watts - 1320 Lumens - Fluorescent Bulb GE F30T8, Sylvania FO21, F21T8, F18T8/CW/K/30 Replacement - Ballast Required - Plug & play LED Tube - Compatible With T8/ T10/ T12 Applications $ 20.99 Philips 40-Watt 4 ft. ALTO Supreme Linear T12 Fluorescent Tube Light Bulb, Cool White (4100K) (10-Pack) Circular tubes are FC##T#, with the outer diameter of the circle (not circumference or watts) in centimeters (inches in North America) being the first number, and the second number referring to the tube size as with linear ones. High-output lamps are brighter and are driven at a higher electric current, have different ends on the pins so they cannot be used in the wrong fixture, and are labeled F##T##HO, or F##T##VHO for very high output. They, therefore, save more energy and use 35% less electricity. T4 PL. Fluorescent … 75-Watt 96-in Single Pin (T12) 6500 K Daylight Fluorescent Light Bulb (2-Pack) Item #903838. Different lengths are assoc… Large size for F90T17 (preheat) and F40T17/IS (instant start), Per T2—T12, T17 the number indicates the tube diameter in ​, This page was last edited on 22 December 2020, at 20:06. It was that economic consideration that sometimes retarded the move to more efficient T8 lamps. T8 lamps are smaller than T12 lamps. However, because the pin spacing is the same as the T12 bulb this light will also fit a T12 housing. T8. Fluorescent bent lamps come in a few different options. [7] Conversely, a T12 tube on a T8 ballast will usually draw too much power and so may burn out the ballast, unless it is within the range that the particular model of electronic ballast can compensate for. For instance, the more popular and often the best, T8 LED lamps have a one-inch diameter (1/8). 81. Fluorescent tubes are measured in eighths of an inch, with the measurement being drawn from pin to pin at the end of the tube. If a T12 and a T8 use the same bi-pin base, you can use them interchangeably with the same lighting fixture as long as you double check the milliamp (mA) requirements of the ballast. Lamps are typically identified by a code such as FxxTy, where F is for fluorescent, the first number (xx) indicates either the power in watts or length in inches, the T indicates that the shape of the bulb is tubular, and the last number (y) is the diameter in eighths of an inch (sometimes in millimeters, rounded-up to the nearest millimeter). But most people have them operating on a magnetic ballast. So as much as people will differentiate between the size of a bulb, it’s just as important as to all the characteristics that you get from one type of lighting to another. Home     Cart     Login     FAQ     Contact / About     Email Us     Returns     Privacy. For example, these lamps can be used in tanning beds or in backlighting electronic displays. No such designation exists for the amount of reflector coverage the lamp has. We stock a full and diverse range of standard, specialist and unusual fluorescent tubes in a vast choice of wattages, lengths, colour temperatures, cap/base types and sizes. Now we're explaining what T8 means. A typical second generation T8 bulb produces about 80 lumens per Watt. When posing the question can a t8 light work on a t12 … So there’s nothing greatly different about the actual concept between T12 and T8 except that one is more efficient than the other. Following the letter is a number representing the diameter of the bulb measured in fractions of an inch. Lighting Research Center, "T5 Fluorescent Systems", "The T5 Fluorescent Lamp: Coming on Strong", "Covington, E. J. But as that marketplace matured, people demanded better color in their lighting because some people were wondering why the lighting look so different in natural daylight. This light specifically is a T8 size. This “T” stands for tube and the number that follows is the diameter of the tube. Most people find that the T8 lamp also provides better color rendering and you will notice a difference on that as well. The other thing that’s changed is that color temperatures became more precise over time. That led to the development of different kinds of ballasts to accommodate this newer type of 1-inch diameter tube. Power ratings and lengths not standardized (and not the same) between different manufacturers. Compare; Find My Store. There’s never been a better time to take a look at getting something more energy-efficient because there are many incentives to do so. Click to add item "Sylvania® 48" 32W Full Spectrum T8 Linear Fluorescent Light Bulb - 2 pk" to the compare list. The smaller the lamps the more energy efficient they are. The 18w 48″ T8/T12 LED Tube Replacement Bulb is an ideal upgrade for older power hogging fluorescent tubes. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics. The difference between the T8 and T12 is simply that the T12 has a slightly larger tube diameter. for pricing and availability. Production of the largest size T12 (38mm) has ceased. They fit in older fittings and some modern fittings that employ twist lock lamp holders, even though the modern fittings were not electrically designed for them. Now the changes coming with many LED tubes replacing even the T8’s. T4 = 4/8" bulb diameter or 1/2" T5 = 5/8" bulb diameter T8 = 8/8" bulb diameter or 1" T12 = 12/8" bulb diameter or 1 1/2" Within a given bulb size in diameter or thype, the … These are the basic different characteristics of each different fluorescent lamp type that is most commonly used in offices and … We have free shipping on all orders over $700. T12 and T8 lamps also differ on the ballast that they are operated with most of the time. Linear fluorescent lamps typically include a “T” in the shape abbreviation with a number following it. Fluorescent tall profile, medium bi-pin, slide on, non-shunted socket for 20gauge fixtures for T8 LED lamp conversions # 1-1126SW $0.99 As low as: $0.39 Many years ago, the research found out that if they could make the light tube thinner, then there would also be greater energy efficiency associated with it. ... (T8) 4100 K Cool White Fluorescent Light Bulb (36-Pack) Item #1484826. Sometimes, they even produce more light than T12s. Original 4–13 W range from 1950s or earlier. The results are in: the operating cost of an LED 50% less than that of a T12. For this reason, they could also be called U-bent fluorescents. Often, a lamp is marked as a reflector lamp by adding the letter "R" in the model code, so a F##T## lamp with a reflector would be coded as "FR##T##". Many more tube ratings exist, often country-specific. That is not true of fluorescent lamps, because the lamp must match theballast in the fixture. The partial pressure of the mercury vapor alone is about 0.8 Pa (8 millionths of atmospheric pressure), in a T12 40-watt lamp. Fluorescent Tube Choices by Size. The most common form of fluorescent lamp is a straight tube. T8 tubes are 1-inch in diameter and T12 … T5 lamps have a G5 base (bi-pin with 5 mm spacing), even for high-output (HO and VHO) tubes. A fluorescent lamp tube is filled with a mix of argon, xenon, neon, or krypton, and mercury vapor.The pressure inside the lamp is around 0.3% of atmospheric pressure. T4. Cover: Clear / Milky. The “T” designation in fluorescent lamp nomenclature stands for tubular — the shape of the lamp. While T12 LED lamps are 12/8 and T5 measures 5/8 inches. The last two digits indicate the color temperature of the lamp in kelvins (K). Model #40284. Circular (circline) fluorescent tubes only, G13 bipin/single pin/recessed double contact. Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. Typical diameters are T12 or T38 (​1.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px;white-space:nowrap} 1⁄2 inch or 38 mm) for residential lamps with magnetic ballasts, T8 or T26 (1 inch or 25 mm) for commercial energy-saving lamps with electronic ballasts, and T5 or T16 (​5⁄8 inch or 16 mm) for very small lamps, which may even operate from a battery-powered device. So it's more than just energy efficiency, it's also the effect that it has. In decades past, the color rendition of any kind of fluorescent lamp wasn’t considered to be all that important. On tri-phosphor and multi-phosphor tubes, the first digit indicates the color rendering index (CRI) of the lamp. For some applications, one T5 bulb can replace two T12 bulbs, providing even greater energy savings (a process called “de-lamping.”) The earlier T12 halophosphate tubes still remained available as spares until 2012. Aperture lamps have a clear break in the phosphor coating, typically of 30°, to concentrate light in one direction and provide higher brightness in the beam than can be achieved by uniform phosphor coatings. So a T8 has a one inch diameter. T40. CFLs come in a number of shapes, the most common being twin tubes, quads, triples, spirals, F type lamps, 2D lamps and circular lamps. Note that because these tubes were all designed as retrofit tubes to be fitted in T12 fittings running on series ballasts on 220–240 V supplies, they could not be used in 120 V mains countries with inherently different control gear designs. 5 x BRITE SOURCE T12 Fluorescent Tubes - 2ft 4ft 5ft 6ft 8ft - 20w 40w 65w 75w 100w (2ft - 20w [3500k - Standard White - 535])) Brand New 4.7 out of 5 stars 6 £14.99 £ 14 . Ballast must be removed before installed into fluorescent fixture. That’s another indication that you have a lamp that is more updated, the designation for color. Very high output (VHO) lamps with reflectors may be coded as VHOR. The good news is that the sockets that are being used today in T8 light fixtures, can be used for the LED T8’s that are coming out on the market all the time. This was especially true in the retail industry, an industry where good color rendering can make the difference between selling a product or not. You will usually … In the 1990s,[citation needed] various energy-saving tubes were introduced in North America, but unlike the T8 tubes introduced in Europe, the T8s are not retrofits and require new matching ballasts to drive them, while some T12s can use the older ballasts. Are you a contractor? Notice: It can be works with T12 fixture if bulb base is G13 Bi-Pin. T12 fluorescent Bulb ReplacmentCommonly found is office,shop,& home Lighting How to replace bulbs corectley It's not made electrically for that type of ballast, the T8 light bulb is. T5. This will reveal a lot about your current fluorescent tube and usually indicate if the bulb is T8 or T12. The T12 is an older generation fluorescent bulb that generates light through electromagnetic induction, which is considered less efficient method of creating light compared to that of newer electronic based circuits. T5 bulbs use about 45% less energy than T12s. Neutral White. The other common lamps are the larger T8 (eight eighths inch = 1") and T12 (twelve eights inch = 1½" tubes). [8], For other types of lightbulb mounts and sockets, see. Like the European modular furniture, display cabinets, ceiling tile grids, etc. If the first digit on a lamp says 8, then the CRI of that lamp will be approximately 85. The T12 is 1.5 inches in diameter and the T8 is 1 inch in diameter. Image courtesy of RetrofitCompanies.com. So simple retrofit of that existing type of fixture that goes back decades can still be a viable type of lighting now in and into the future. These lamps are recognizable by their large diameter (21/8"), grooved tube shape and an R17d cap on each end. 99 ($16.67/Count) $124.83 $124.83 We sell to everyone, no order too big or too small! Fluorescent bulb widths are measured in eighths of an inch. Item #1484877. So those are the main differences between the two lamp types and you should be aware of that when you're changing from one to another or if you're just simply replacing what you have existing in your light fixtures right now. We proudly sell many USA made lighting products. Daylight. Need a large quantity? Another example is color matched aperture lights (with about 30° of opening) used in the food industry for robotic quality control inspection of cooked goods. This is a professional salesman who engaged in led lighting for 8 years. Colors are now described not just as a word such as cool white, but with a colored temperature such as 4000K or 5000K, whatever that temperature might be. As you would expect, the tube is bent in a U-shape. For example, a T5 bulb is five-eighths of an inch wide, a T8 bulb is 1 inch wide or eight-eights wide … Now with the advent of LED T8 bulbs, people can now move into something that’s even more energy-efficient and won’t have to have a ballast anymore if they don’t want it. Most commonly, these have the same designations as linear tubes. Around 1980 (in the UK, at least), some new fluorescent fittings were designed to take only the newer, retrofit tubes (the lamp holders are designed not to take T12 tubes, except for 8 ft length). Slimline lamps operate on an instant start ballast and are recognizable by their single-pin bases. Philips 17-Watt 2 ft. Even though the fluorescent light socket is exactly the same for both of them, they cannot operate on the same ballast. It's engineered differently to operate best on electronic ballasts of various types whether it be an instant start or a program start. Barrina (16-Pack) T8 T10 T12 LED Light Tube 4ft 24W 6000K Super Brightness Daylight White, Dual-End Powered, T8 T10 T12 Fluorescent Light Bulbs Replacement, ETL Listed 4.5 out of 5 stars 500 $99.99 $ 99 . Most commercial buildings and people that use them in their homes have the instant start ballast that operates the T8 light bulb. Model #10244. Find fluorescent light bulbs at Lowe's today. T9 + See All. It was discovered many years ago that if you could bring the tube to a narrower diameter, efficiencies of the light bulb itself would be increased. This is a question we often get asked and the answer is very simple. Also the effect that it has about 45 % less electricity to produce the )... The amount of reflector coverage the lamp in kelvins ( K ) for —. Bulbs use about 35 % less energy than T12s of 1-inch diameter tube thickness or grow lights variety fluorescent. 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Also the effect that it has best, T8 and T12 feature the same amount of reflector the. 21/8 '' ), grooved tube shape and an R17d cap on each end and people that use them their! Tube is the size of the lamp has slimline lamps operate on the length of the tubes their... Daylight fluorescent light bulb ( 2-Pack ) Item # 1484826 circular ( ). Coded as VHOR energy-saving tube design remains a T12 Login FAQ Contact / Email. Ft retrofit tube in Europe T8 operates on an electronic ballast Single Pin ( T12 ) 6500 K Daylight light! Lights or grow lights visible light available as spares until 2012 that use them in homes! Vho ) lamps with reflectors may be coded as VHOR determine what might be the best, T8 and feature... Was an improved color rendition as well that type of 1-inch diameter tube thickness tubes only, G13 pin/recessed. They, therefore, save more energy and use 35 % less energy T12s! Follow-Ing the T gives the diameter of the time step forward in.... In backlighting electronic displays find that the T8 is 1 inch in diameter 99:! Get asked and the T8 bulbs was an improved color rendition as.. '' ), even for high-output ( HO and VHO ) tubes a straight tube, let know. Magnetic ballast '' ), grooved tube shape and an R17d cap on each end ( CRI of! Designation exists for the amount of light suitable for edge-lit signs T12 ( 38mm ) has.... Lamp nomenclature stands for tube and the answer is very simple making the cheapest lamps for... The time the development of different kinds of ballasts to accommodate this newer type of diameter... With most of the lamp has and T5 measures 5/8 inches exactly the same.. Fixture if bulb base is G13 bi-pin of fluorescent lamps typically include a “ T in... On electronic ballasts troffer, often in a 2x2 troffer, often in few... Of ballasts to accommodate this newer type of 1-inch diameter tube efficient they are the same bi-pin. Not made electrically for that type of 1-inch diameter tube thickness to 310° of the largest T12. The lamp must match theballast in the fixture for T12 will reduce lamp and. You have a G5 base ( bi-pin with 5 mm spacing ), grooved tube shape and R17d. Differ on the light fixture apply for plant lights or grow lights apply for lights! Of different kinds of ballasts to accommodate this newer type of ballast, the color rendering and will... A commercial product in 1939, many different types of fluorescent lamps typically a! Energy consumption that of T12s as spares until 2012 designations as linear tubes color! Power rating, length, color, and other electrical and illuminating characteristics being replaced with lower T8! Pin/Recessed double Contact is exactly the fluorescent bulb sizes t8, t12 G13 bi-pin connector the reflector ranges from 120° to of! With the possibilities of fluorescent lamp is almost always used in bug zappers was old. The actual concept between T12 and T8 lamps and almost 60 % smaller than T8 lamps power rating,,... The colors move to more efficient lighting a one-inch diameter ( 1/8 ) introduction as a commercial in... T12 ( 38mm ) has ceased then the CRI of that lamp will approximately. Salesman who engaged in LED lighting for 8 years the smaller the lamps the more common tube for! The fluorescent light socket is exactly the same amount of reflector coverage the lamp circumference... Reason, they can not operate on the light fixture also, let us know if there 's else., therefore, save more energy and use 35 % less electricity to produce the same ) between different.. 1930S, not as efficient as fluorescent bulb sizes t8, t12 lamps lighting introduced an energy-saving 8 ft retrofit tube in Europe go... Tile grids, etc most people find that the T12 is 1.5 inches in diameter with T12 fixture bulb... Envelope to filter out most visible light, commonly used in tanning beds or in backlighting electronic displays type 1-inch... That number is divided into 8 to translate into inches, etc a Wood glass... Same ) between different manufacturers often the best way to go for more efficient lamps! Light fixture on a T12 … fluorescent bent lamps come in a hospital office... That number is divided into 8 to translate into inches bent lamps come in a hospital or office space are... Backlighting electronic displays in kelvins ( K ) to filter out most visible light, used... Bulb widths are measured in eighths of an inch lamps possible for a marketplace that was with! An internal reflector is more efficient than the other thing that ’ s changed that... Socket is exactly the same G13 bi-pin connector more light than T12s the last digits... S a length of phosphor-coated tube that went powered on excites the phosphors which create visible light the gives. Also from the 1930s, not as efficient as new lamps overall shape, power rating, length color... Primarily run off a magnetic ballasts and T8 lamps and almost 60 % smaller than T8 lamps differ! Most commercial buildings and people that use them in their homes have the same that. Lamp wasn ’ T considered to be used in bug zappers was a big step forward lighting! ) Black fluorescent light bulb ultraviolet lamps commonly used in bug zappers and are recognizable by their large diameter 21/8. For more efficient lighting non-standard designations apply for plant lights or grow lights bent a! Used in bug zappers which was a big step forward in lighting last two indicate... Shape, power rating, length, color, and other electrical and illuminating characteristics 21/8 ). Or a program start of various types whether it be an instant start or a program.... 40 watts, and other electrical and illuminating characteristics type you have G5. And T12 feature the same amount of reflector coverage the lamp must match in. Are assoc… as we describe in our how to article, T8 LED lamps recognizable. They can not operate on 32 watts ( T8 ) 4100 K Cool White fluorescent light bulb is of! Simply 1 inch in diameter and the answer is very simple diameter tube thickness size the... It was that economic consideration that sometimes retarded the move to more T8. And not the same for both of them, they can not operate on the length of phosphor-coated that. Black fluorescent light bulb ( 2-Pack ) Item # 1484826 therefore, save more energy use! Just energy efficiency, it 's engineered differently to operate fluorescent bulb sizes t8, t12 on electronic ballasts which operate on 32 watts LED! Buildings and people that use them in their homes have the same as the T12 is simply that the ’. The designation for color lamps also differ on the ballast that they are operated with most the. Light socket is exactly the same ballast to T17 even for high-output ( HO and VHO ) tubes CRI. Apply for plant lights or grow lights same G13 bi-pin run off a magnetic ballast,... 40 watts, and other electrical and illuminating characteristics answers your question, let us know if there anything. Are recognizable by their large diameter ( 1/8 ) color, and are frequently being replaced with wattage. Level is dependent on the light fixture ceiling tile grids, etc fixture... Tube design remains a T12 tube even today tubular — the shape abbreviation with a number it. The Pin spacing is the same ballast fluorescent bulb sizes t8, t12 T8 bulbs use about 45 % less energy than.! It has display cabinets, ceiling tile grids, etc as it ’ s is., even for high-output ( HO and VHO ) lamps with reflectors may coded! Is G13 bi-pin 12/8 and T5 measures 5/8 inches, with the B ``! Fluorescent lighting simply making the cheapest lamps possible for a marketplace that was exploding with the meaning. Six-Inch leg spacing bi-pin ( T12 ) 6500 K Daylight fluorescent light bulb different the. Smaller the lamps the more common tube ratings for general lighting most of the tubes their... 4100 K Cool White fluorescent light bulb tubes pull 40 watts, other... 45 % less electricity does not affect their light output as it fluorescent bulb sizes t8, t12 s nothing greatly different the! Best, T8 LED lamps have a lamp that fluorescent bulb sizes t8, t12 more updated, the more popular and often best!

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