Posted in Home Decor Candles on 05/06/2003 03:36 pm by admin
Does 120 VAC LED light bulb have a built in rectifier?
LED light bulb works on forwar bias and off on reverse bias. Are we simply let the negative part of the AC current go wasted (as it can not light up the bulb) or we rectify it (the negative AC) to continue lighting up the bulb? If the negative part of the current is not use, will the LED light bulb flicker like the florescent light?
To start off, just because it allows current one way does not mean it is a true rec. A rec is a series of four diodes, and leD is one by definition and therefore cannot be a rectifier.
To actually answer your question, AC current varys at a rate of 60Hz in the United States, so even if you did not rectify the currect you would not see flickering (TVs changes full pictures at a rate of 30Hz). Instead, the lightbulb would appear half as bright. This is actually how many display boards control brightness, plusing the lights on and off very very quickly at different rates (the faster the brighter).
For a lightbulb, however, especially when dealing with LEDs, one wants want max brightness (LEDs are generally not very bright). I assume, therefore, that commercial LED bulbs have built in recs as to maximize brightness.
Philips AmbientLED (TM) Dimmable 60W Replacement A19 LED Light Bulb - Soft Warm White
Philips AmbientLED (TM) Dimmable 12.5W A19 LED light bulb has earn Energy Star (R) qualification and offers light quality comparable to that of traditional general incandescent 60W light bulb...
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Adds safety security and convenience. Programmable off-timer from 2,5,8 hours random off timer deters intruders. Contact plunger allows adjustment of sensor window direction for optimum performance. Works with incandescent and compact fluorescent bulb...
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4 Pack Philips Ambient LED (TM) Dimmable 60W Replacement A19 LED Light Bulb - Soft Warm White Philips AmbientLED (TM) Dimmable 12.5W A19 LED light bulb has earn Energy Star (R) qualification and offers light quality comparable to that of traditional general incandescent 60W light bulb...
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HP s2031 20" LCD Monitor WJ676AA#ABA LCD Flat Panel Displays
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Asus VH236H Widescreen LCD Monitor VH236H LCD Flat Panel Displays
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Acer X1161P 3D Ready DLP Projector EY.JBU01.009 Projectors
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Bright the elegance of a miniature candelabra to the little special spots of your home, office, or chateau. The Flickering Candelabra uses advanced computer algorithms, an exposed Printed Circuit Board, and miniaturized LEDs to create a high-resolution "flickering candle effect...
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Flicker LED Wax 3-piece Candle Set
$59.61
With a true-to-life flicker effect, this set of three electronic wax candles will offer you a safe alternative to natural candle light. Using LED bulbs, these candles can set a romantic mood that you can blow out like a regular candle. Unique air activated on/off sensor so you can blow them out like real candles Requires three (3) AAA Batteries (not included) Setting: IndoorFixture finish: Natural wax On/off switch Number of lights: One (1) light per candleNumber of bulbs: Three (3) LED bulbs (included) Dimensions: 6 inches high x 3 inches in diameter Set of 3 candles
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Flicker
$20.99
Track Listing: 1. It's Been Fun, 2. Counterblow, 3. Selling Rebellion, 4. My Revenge on the World, 5. Pink Dress, 6. St. Edith, 7. Infiltrating My Way Through the System, 8. Be Me, 9. Post Apocalyptic Girl, 10. Cutting, 11. My Device, 12. Flicker, 13. Lovely Day
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FLicKeR -
$24.99
This documentary profiles pop icon and gay activist Brion Gysin in his creation of the so-called Dream Machine -- a device designed to emit light that flickered in a pattern that would cause the brain to produce alpha waves and enter a dream state. Hoping to help subvert thought, Gysin took his machine to many famous artists and musicians, who had strong creative reactions to the Dream Machine's effects. ~ Cammila Albertson, Rovi
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Flicker Flash
$14.15
An illuminating collection of poetry celebrates the excitement, drama, and comfort of light in its many forms, from the flicker of birthday candles and a flash of lightning to the bold bright sun and the serene full moon. Reprint.
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