Does anyone know who is making these light bulbs?
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Posted by Robert Green on March 23, 2007, 11:48 am
Please log in for more thread options says: "The Cold Cathode Fluorescent Light (CCFL) is one of the newest forms of CFL. CCFLs use electrodes without a filament. The voltage of CCFL lamps is about 5 times higher than CFL lamps and the current is about 10 times lower. CCFL lamps have a diameter of about 3 millimeters. The lifetime of CCFL lamps is about 50,000 hours. The lumens per watt is about half of CFL lamps. Initially CCFL was used for thin monitors and backlighting, but **now it is also manufactured for use as a lightbulb.** Since the efficacy (watt/lumen) is actually lower than a compact fluorescent light, it is actually not as efficient as a CFL. Its advantages are that it is (1) instant-on, like an incandescent, (2) compatible with timers, photocells, and dimmers, and (3) has an amazingly long life of approximately 50,000 hours. CCFL are a convenient transition-technology for those who are not comfortable with the short lag-time associated with the initial lighting of Compact Fluorescents. They are also an effective and efficient replacement for lighting that is turned on and off frequently with little extended use (e.g. a half-bath or closet)." ** Emphasis mine -- Bobby G. | |||||||||||||
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Posted by Robert L Bass on March 23, 2007, 1:18 pm
Please log in for more thread options http://www.bosstar.com/ (appears to be a manufacturer) http://www.mbelectronics.com (retailer) http://www.maxim-ic.com/appnotes.cfm/appnote_number/3528 (application notes) http://www.sunbeamtech.com/ (PC supplier) -- Regards, Robert L Bass =============================>
Bass Home Electronics
941-925-8650 4883 Fallcrest Circle Sarasota · Florida · 34233 http://www.bassburglaralarms.com =============================>
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Posted by Robert Green on March 23, 2007, 3:14 pm
Please log in for more thread options > Following are a few sources:
notes)
> http://www.bosstar.com/ (appears to be a manufacturer) > http://www.mbelectronics.com (retailer) > http://www.maxim-ic.com/appnotes.cfm/appnote_number/3528 (application > http://www.sunbeamtech.com/ (PC supplier)
Thanks. These apparently are all long, small tubes. CCFL's are very popular as laptop backlights but I have been looking all day for 110VAC screw-base CCFL's to no avail. They sound very useful for lights controlled by motion detectors and places where waiting for a CFL to come to full brightness might be a safety issues, like staircases. We're due for another big rate increase in the DC area and I'd like to find CFL's that work in the places that have previously given me problems. -- Bobby G. | |||||||||||||
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Posted by Slammer on March 23, 2007, 4:12 pm
Please log in for more thread options >> Following are a few sources:
>> http://www.bosstar.com/ (appears to be a manufacturer) >> http://www.mbelectronics.com (retailer) >> http://www.maxim-ic.com/appnotes.cfm/appnote_number/3528 (application > notes)
>> http://www.sunbeamtech.com/ (PC supplier)
>
> Thanks. These apparently are all long, small tubes. CCFL's are very > popular > as laptop backlights but I have been looking all day for 110VAC screw-base > CCFL's to no avail. They sound very useful for lights controlled by > motion > detectors and places where waiting for a CFL to come to full brightness > might be a safety issues, like staircases. We're due for another big rate > increase in the DC area and I'd like to find CFL's that work in the places > that have previously given me problems. > > -- > Bobby G. READ the application notes above. You won't find any 120VAC screw type CCFL. They need a step-up transformer as they operate at 180-800VAC or higher. Since this is most often a 2-3V source, the switching is done at 100KHz or higher. A 120:1200 VAC transformer with current limiting circuitry would be too expensive. Beware some pwr supplies operate at 5,000VAC--so 300V or 600V insulation is a no-no. I'd buy the wiring harness/set. See http://www.mbelectronics.com/view.aspx?id=260&name=Power%20Supplies%20,%20CCFL or http://www.solarlighting.com/cut_sheet_CCFL_transformer_model_5000.html for pwr supply http://www.coilcraft.com/pdfs/fl.pdf for transformers and http://www.mbelectronics.com/view.aspx?id=261&name=12"%20Cold%20Cathode%20Fluorescent%20Lamps%20,%20CCFL for bulbs. You might try: http://www.ccfldirect.com/customlamps.html What's wrong with LED's? They are intrinically safe. | |||||||||||||
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Posted by Robert Green on March 23, 2007, 6:28 pm
Please log in for more thread options > >> Following are a few sources:
> >> http://www.bosstar.com/ (appears to be a manufacturer) > >> http://www.mbelectronics.com (retailer) > >> http://www.maxim-ic.com/appnotes.cfm/appnote_number/3528 (application > > notes)
> >> http://www.sunbeamtech.com/ (PC supplier)
> >
screw-base
> > Thanks. These apparently are all long, small tubes. CCFL's are very > > popular > > as laptop backlights but I have been looking all day for 110VAC > > CCFL's to no avail. They sound very useful for lights controlled by
rate
> > motion > > detectors and places where waiting for a CFL to come to full brightness > > might be a safety issues, like staircases. We're due for another big > > increase in the DC area and I'd like to find CFL's that work in the
places
> > that have previously given me problems.
> > > > -- > > Bobby G. >
> READ the application notes above. > > You won't find any 120VAC screw type CCFL. They need a step-up > transformer as they operate at 180-800VAC or higher. Sorry. I should have indicated why I was interested in the CCFLs. The Wikipedia article strongly suggested such lamps were available in standard formats, indirectly, I suppose, but here's what they said: "Initially CCFL was used for thin monitors and backlighting, but now it is also manufactured for use as a lightbulb" A little further on they say "are also an effective and efficient replacement for lighting that is turned on and off frequently with little extended use (e.g. a half-bath or closet)." That *sounds* like a screw-base standard lightbulb format, but they spell some words with a British flavour so they may be talking about 240VAC mains. > Since this is most
> often a 2-3V source, the switching is done at 100KHz or higher. A > 120:1200 VAC transformer with current limiting circuitry would be too > expensive. Beware some pwr supplies operate at 5,000VAC--so 300V > or 600V insulation is a no-no. I'd buy the wiring harness/set. Dude, it's screw-in bulbs or screw it altogether! (-: I was attracted by the claim: "Advantages are that it is (1) instant-on, like an incandescent, (2) compatible with timers, photocells, and dimmers, and (3) has an amazingly long life of approximately 50,000 hours." That would be a great bulb for the stairways and the bathroom. CFL's don't last long when operated 40 times a day. <stuff snipped>
> See
Thanks for the cites. I don't think I'm uninterested if it's not "plug compatible" as the mainframers used to say. I was reading up on "choppers" when I came across the description of the CCFL's as replacement for regular CFL's and hoped someone out there was actually using one or knew where to buy one. > What's wrong with LED's? They are intrinically safe.
Nothing. As far as I know. I wonder how they'll live with X-10? My experience with early CFL's that required filters, $10 a bulb, modulectomies AND that failed quite early inclines me NOT to be on the leading edge of the LED lighting wave. (-: I did buy some great LED flashlights and emergency lights recently because they are so miserly with battery power and lose no energy to voltage conversion, but they still seem a little too weird, lightwise. Maybe in time. -- Bobby G. | |||||||||||||
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