 thenderScreen tycoonPremium
join:2009-01-01
Brooklyn, NY
kudos:1 | Ignorant LED lighting question. »cgi.ebay.com/ws/eBayISAPI.dll?Vi···15659017
I thought LEDs worked off of DC power - how is it this is rated to work with 100-240 VAC? Is it a special LED that works off of AC? Does it have a power supply inside of it? is it just an error.
I figured since it said 100-240VAC it would be a drop in replacement for a fluorescent fixture without much modification required.
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 shdesignsPowered By Infinite Improbabilty DrivePremium
join:2000-12-01
Stone Mountain, GA | LED light assemblies have rectifiers and filter caps to convert to DC then a switching regulator to control power.
I would imagine you would need to remove the ballast and wire to 120V to use the bulbs. |
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lutful... of ideasPremium
join:2005-06-16
Ottawa, ON Reviews:
 ·TekSavvy DSL
1 edit | reply to thender
said by thender:I thought LEDs worked off of DC power - how is it this is rated to work with 100-240 VAC? Is it a special LED that works off of AC? Does it have a power supply inside of it? is it just an error. FYI there are actually a few "AC-LEDs" that operate directly from AC line voltage ... but majority of AC LED lamps use what is called an "off-line" LED driver IC.
Good example: »www.linear.com/products/offline_led_driver
The LT3799 is an isolated LED controller with active power factor correction (PFC), specifically designed for driving LEDs from a universal input range of 90VAC to 265VAC
*** I could not check that particular eBay item (URL asked me to log in first) but cheap no-brand LED lamps may have poorly designed AC-DC conversion stage using low-cost discrete components.
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