Luka,
I'm certainly not familiar with the AOTF concept, but reading up:
http://www.olympusmicro.com/primer/t...aotfintro.html
It sounds very difficult to envisage how this could be set-up and arranged to provide a useful astronomical spectrum....
Unless you have some prior working knowledge I'd put it in the too hard basket.....
Have you had such a device working for you???