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~:-(I have a feeling it will be like the drinking ban, you can have a shitty gov, you can tax the hell out of me, but you can't take my filament light bulbs!!!!!!!!!!!!!! You can guess my idea of this law,
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
The issue is, they do make dimmer ones, but they do say "Do not use in areas like bathrooms" because they are constantly being turned on-off which shortens the life by far. If they ban filament bulbs, well, this is going to be voided I guess, and people will have to use it anyway.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The warm up time in the spiral lights is a trade off. Fluorescent lamps have a very narrow range of bulb wall temperatures for a given lamp diameter T8 and T12 seem the best. The moguls (T17) vanished about 60 years ago although stashes of them do exist
Check out the charming list of phosphors used 68 years ago !
Registered Member #1361
Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
Killa-X wrote ...
The issue is, they do make dimmer ones, but they do say "Do not use in areas like bathrooms" because they are constantly being turned on-off which shortens the life by far. If they ban filament bulbs, well, this is going to be voided I guess, and people will have to use it anyway.
I think another reason may be the high moisture levels when you are having a shower etc. With regular lightbulbs, there is no circuitry to worry about shorting out with condensation, but with CFL's, condensation could build up on the PCB and cause arcovers.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
pauleddy wrote ...
Anther reason is something I learned when I went to regional’s in sci fair. The student next to me had done research on CFLs last year she determine that the filament in these light don’t last as long as normal bulbs something about on off cycles. She went to internationals last year (me with my petty disk launcher not a chance). This year she develop a way to run the bulbs with microwaves, the tubes that the filament burnt out she would put in a small faraday cage and have an microwave antenna in it (her dad runs some physic lab she had acces to really great lab equipment) she of course won a few grant and went to internationals again and she got a patent offer for it too. Hmmm vary interesting idea. But still don’t like the warm time.
yeah, i think i've heard about this. the problem iirc is that the required magnetron wastes a lot of power but the efficiency is still higher than HPS.
interestingly there are now multi-KW GaAs microwave HEMTs and MOSFETs which could be used to build a solid state magnetron replacement. the usual cost versus quantity argument applies here, so if something is made by the million at a time then the cost goes down to the point that in a few years microwave lamps may be competitive with the new high output LEDs being made.
of course if they make a breakthrough in OLED technology in the meantime (where the heck is my OLED "EL wire already?!) which makes the longevity comparable with LEDs then they may win the race to become the dominant lighting standard.
interestingly with OLEDs the main limitation is heat, the polymer degrades exponentially with increasing temperature so that at 80C it lasts say 50 hours rather than 5000 hours at 40C. it appears that as the polymers heat up hot spots form, causing a runaway breakdown similar to that seen in LEDs.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Heh, funny you mention that Conundrum. My friend has lots of El-Wire, cool stuff to mess with, fun to put a lot of your clothes at night and walk around with a out-line shape.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Conundrum wrote ...
pauleddy wrote ... ... This year she develop a way to run the bulbs with microwaves, the tubes that the filament burnt out she would put in a small faraday cage and have an microwave antenna in it ... Hmmm vary interesting idea. But still don’t like the warm time.
yeah, i think i've heard about this. the problem iirc is that the required magnetron wastes a lot of power but the efficiency is still higher than HPS. ... in a few years microwave lamps may be competitive with the new high output LEDs being made.
Magnetron-based microwave lamps (using sulphur plasma globes) aren't quite extinct. According to Wikipedia, these folks are giving it a go one more time. As of 10 years ago, the technology included lightbulbs that lasted 10s of 1000s of hours and put out more than 100 lumens of "white" light per watt of electricity. Which is more efficient than white LED systems on the market today. They -do- take a couple minutes to warm up, and have never been claimed to be economical at scales less than about 100 K lumens.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Kludgesmith wrote:
The common double helix CFL coil shape is, if you think about it, about as non-inductive as you could make with that length of tubing.
The reason for the mercury is to see if it could be filled and measured. Better somone else, less clumsy than me try it. I'd hate to have to mining my stash of Adlake relays to replenish my Hg .
I had in mind copper sulphate to use as an expendable load for the an EMP testing line termination as descibed in AT&T's plans which filled flexible hoses. Or any substance you want to hammer non-inductively.
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CFL Bang
