Comment by bayindirh

The OSRAM halogen lamp I use has special filters, and looks greenish when it's turned off, so it might not be a "brute force, let everything through", 25¢ halogen lamp. The bad thing is it's not being produced anymore, but I have a couple of spares.

I went through university with the same lamp/bulb, so that combo doesn't create the unwanted reflections much. Also, I still print everything in color, because a good color choice still boosts understandability of the material at hand.