lutful... of ideasPremiumReviews:
reply to thender
Re: Ignorant LED lighting question.
said by thender: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.
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.
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.