Wellp, yeah, but I got a coupla these

and a prism, but neither does me any good without the LEDs. :open_mouth:

Was hoping someone who had the LEDs either knew the type or could take a peek and see.

The spectrometer is pretty good and at least close, based on Hg lines in fluorescent bulbs that I tried. It’s a bit hard to see unless the light source is pretty intense, though.

Interesting design on those thingies, snipping apart a dvd to get to the “diffraction grating”. :smiley: