running LEDs to the max, 200A

Winfield Hill · 2019-03-18T22:01:59+00:00

We're using a blue OSRAM projection LED, for fluorescence neural imaging. Rated for 20W of light with 20A of current drive, and with spec'd 30A pulse, and 40A surge for 10us, we drive it with 200A for 45us to get our needed photons (each $30 LED lasts about 2 months). Straight-forward 200A current-source-drive circuit, AoE x-Chapter writeup, read it here: -- Thanks, - Win

Mar 18, 2019 21 Replies

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Winfield Hill 7 years ago

Coming at 200 or 250 sets/sec, they look like continous bright light.

Thanks, - Win

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Winfield Hill 7 years ago

I checked with Drew, one of the researchers, who said that indeed the blue light looks extremely intense to the fish, but they rapidly acclimatize to it, in a matter of minutes, and then carry on searching for food, etc., just as before. They have no trouble seeing things illuminated with white light, using the eye's other wavelength receptors. The experiments last for hours, or sometimes even days, if they have a reason to do it that way.

Thanks, - Win

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