a mirror tint allows you to look from the dark side into the illuminated side, and hinders vision in the other direction. so this only works when the light source is where the BP is. also you would need to work with a foil or something, in order to get a reflection and not just random scattering it needs to be so precise that you cannot just spray it on or paint it on. and after all that, you might find out that the BP is spooked by its own reflection. they are definitively not as smart as chimps or dolphins, which can recognize their own reflection.

there is a scientific study floating around that shows that BPs have photoreceptors in their eyes for blueish-green, blue, and ultraviolet light. so their vision should be weakest in red, they could very well be completely blind to red light. i would go for a red LED, they tend to have very pure red light without other colors mixed in. i salvaged some from broken optical computer mouses, these are nice and bright. (or is it mice? mice sounds weird when its about the input device). or you can just order from digikey.com , they have thousands of LEDs and also everything else you might need to build a nice red LED lamp. theoretically the snake should not be able to see it.

but then, if the initial strike occurs with a little light, if you just stand still and dont move around or make noises, the snake should go through with it. even if the snake notices your presence, if she gets handled often and is accustomed to you or to humans in general, i dont think it should be a problem. i would try and experiment a bit more before looking for technical solutions to a problem that may not really be a problem.