Has anybody seen output tests of, well, any of the popular LEDs at lower drive levels? Specifically, what is mA difference between 1-5-15 lumens out of a typical 3535 LED such as the 219B these days? While I’m sure that number will vary based on efficiency between the various options out there, I would think at such a low level it would remain fairly tight.
Cree PCT says 155 lm/W, 41.5lm, 2.67V for a XP-G3 R3 at the lowest measurement of 100mA. lm/W Efficiency seems to improve about 5% every time the current is halved, and lm/A 3%.
Extrapolating that I would guess about 33mA for 15lm, 10mA for 5lm, 2mA for 1lm. A bit more for the 219B because of higher CRI. At 1lm the driver could easily take more power than the LED.
Yup we have big efficiency problems at low LED output with most of the blf drivers. It’s where zebralights really shine