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GonZo 
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 Topic: All those bleeden T’s
Posted: September 18 2003 at 6:11pm |
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I've seen and heard of T3's, T5's, and T12 (I think there was a twelve). What do they mean and are there more?
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Cortney (West Jordan)
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Marcus
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Posted: September 18 2003 at 7:17pm |
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There is also T8's and probably more. The sizes are for different thicknesses of the bulb. They may have slight differences in wattage outputs also. As for the exact sizes, I do not know off the top of my head.
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Mark Peterson
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Posted: September 18 2003 at 7:35pm |
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T12 - 1.3 inch diameter
T8 - 1 inch
T5 - approx 3/4 inch but I have not actuqally measured them.
T3 - don't know if I've seen 'um, but they are probably the 1/2 inch type used in those small portable emergency lamps.
When I used 2- 32 watt 3' T8 actinics on a cuttings tank driven with an old tar ballast made to be used for 40W 4' T12's the light came out pretty bright and grew stony's like crazy. I had it going for almost a year and didn't notice any loss of intensity, probably because the tubes were being overdriven. So I don't know how long the tubes would have lasted.
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Marcus
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Posted: September 18 2003 at 10:44pm |
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FYI, under-powering flourescent bulbs causes more harm than over-powering them.
I think T5 are 5/8".
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jfinch
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Posted: September 20 2003 at 5:49pm |
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The number after the T is 1/8ths of an inch. So T5 are 5/8", T8 are 8/8" (or 1 inch) and T12 are 12/8" (or 1.5 inch).
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Mark Peterson
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Posted: September 21 2003 at 2:26pm |
That scheme has good intentions, but measure them and you will see the true diameter. I just measured a T12. It's 1-3/8 inch(approx 1.3"). I don't have the others handy to measure.
 How can underpowering harm less than overpowering? That makes no sense to me. Overpowering makes them brighter and burns them out sooner. Underpowering, to a point, makes them dimmer and last (just a little?) longer. Of course too little power and they just glow at the ends and don't turn on.
Sorry guys 
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Marcus
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Posted: September 21 2003 at 7:59pm |
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According to the engineers at Fullham Inc. (makers of workhorse ballasts) and the guys at commercial lighting, underpowering flourescent lamps will make them burn out sooner. I'm not a lighting expert, I just listened to the guys that are.
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jfinch
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Posted: September 21 2003 at 8:52pm |
Mark, it's not my scale... it's just how it was explained to me by a "lighting guy". Maybe it's a standard that no one follows  .
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jfinch
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Posted: September 24 2003 at 8:38pm |
Hey mark, I was just at fulhams web site and noticed something... check out http://www.fulham.com and look at the lamp size pull down menu... maybe you need a better ruler 
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