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lumileds

Will LEDs go purple?

September 20, 2019 By Lee Teschler

LEDs go purple

Examine an LED bulb and you are likely to find the LEDs on board are phosphor-converted white LEDs (PC-LEDs). These are created either from blue- or near-ultraviolet-emitting chips emitting light at about 450 nm that are coated with a yellow phosphor. The phosphor down-converts the light output into lower visible light frequencies. PC-LEDs that operate […]

Filed Under: FAQ, Featured, LED Lighting Tagged With: lumileds, osram, soraa

What’s all this stuff about capacitive power supplies for LEDs?

June 14, 2017 By Lee Teschler

capacitive LED supply

A while back a viewer of our 60-W LED bulb teardowns posted a comment about the complexity of the power supplies found in the bases of these bulbs. We talked about some of the reasons these bulbs contain switching supplies in a previous article. But our latest post elicited this comment from another reader: Well, […]

Filed Under: LED Lighting, Power Supplies Tagged With: lumileds, microchiptechnologyinc

Why do we need all this LED driver stuff, anyway?

May 11, 2017 By Lee Teschler

home ever LED bulb

The late Bob Pease, a venerated and well-liked engineer at National Semiconductor Corp. (now part of Texas Instruments) once wrote a series of technical musings inspired by questions that mostly younger engineers had to put to him somewhere along the line. We thought back to how Mr. Pease might have reacted when we noticed a […]

Filed Under: Featured, Lighting Tagged With: lumileds

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