Brightest ever LED engine for epifluorescent microscopy?

I finally put together one of the coolest things I think I’ve ever
built, and just in time for the holiday break: a multichannel high-speed
LED driver driving three 27 amp CBT-90 LEDs using a custom built mux that can
switch the 27 amp channels in under 1 µs!

Picture of the mux board connected to three CBT-90 LEDs:

The LED driver in action on our macroscope (turn up the volume!):

We are getting the following power outputs at the sample plane:
Excitation power @ 474/27 nm - 620 mW
Excitation power @ 554/23 nm - 188 mW
Excitation power @ 635/18 nm - 410 mW

If you want to build your own, the KiCAD design files for the 4x1 mux board
can be found here:

As always, if you have any questions, feel free to ask,

Ben Smith

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