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kruser
Premium
join:2002-06-01
Eastern MO
reply to tschmidt

Re: Interesting article about the state of lighting.

said by tschmidt:

I am intrigued by LED lighting but think that tubular form should use a different connector then standard T8/T12 bulbs since they are not compatible.

/Tom

I agree with that fully. Not sure what happens if you plug a standard T12 or T8 tube into a socket that has been re-wired for direct 120 volt line voltage!
The only thing good about it that I could see (other than the cost savings) was the fact that the LED lamp would simply not light if you insert a new one backwards.
I guess you could wire both end sockets with line voltage so it would not matter which way you insert the LED tube. The tube I looked at had dummy pins (still brass pins) on the non powered end. They did not go to internally.


tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
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said by kruser:

I agree with that fully. Not sure what happens if you plug a standard T12 or T8 tube into a socket that has been re-wired for direct 120 volt line voltage!

If the LED tube is fed with 120 volts at one end and the other is simply a mechanical attachment plugging a florescent tube puts 120v across the filament. That would probably be prettying exciting.

quote:
OSRAM SYLVANIA’s LED T8 Commercial Grade replacement lamps are an energy saving LED alternative to traditional T12 or T8 fluorescent lamps combining innovative optical and mechanical design features. These lamps have a dedicated internal driver (120-277V) allowing them to be powered with direct AC by simply disconnecting the fluorescent ballast. The long 40,000 hour life (L70) lamps are available in 11W, 2-foot and 22W, 4-foot versions saving up to 30% in energy costs over 17W and 32W fluorescent lamps, respectively. There are a variety of color temperatures 2700K, 3000K, 3500K, 4100K and 5000K to choose from and good color rendering properties with a 84-87 CRI.

»www.sylvania.com/en-us/products/···mps.aspx

Florescent tubes work by ionizing mercury. Once the filament burned out I assume line voltage would be able to maintain an arc, since we are only talking about a half inch between filament supports. With nothing limiting current (assuming socket is directly wired to mains) the end will get very hot very quickly and probably shatter. All this will probably occur at current and time-frames that will not trip circuit over-current protection. But that is just a guess.

Someone up for an experiment?

/tom
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