Untitled attachment

Notices where this attachment appears

1. teddy (tedyapo@fosstodon.org)'s status on Sunday, 12-Jan-2025 06:04:23 JST teddy

   in reply to

   but why?, you ask.

   LEDs efficiency is a strong function of driving current. e.g., here's the measured relative efficiency of a "3W" LED. the LED is rated for 350 mA forward current, but if you drive it that hard, efficiency drops by 40%.

   if you've heard of the dubai lamp, this is how they did it. this particular LED is most efficient when driven around 35 mA, 1/10 of its rated current (which is set by thermal constraints)

   i'm developing an ultra-efficient LED driver, so i need this data