Hello, I'm new to this forum; in the early 90's I helped build several electronics projects for my children school projects. One which i'v been searching is a "light meter with an infra-red eye and a small speaker", you could HEAR the captured light intensity spectrum rather than to measure it's intensity. It was so good it would capture a lighting bug's light wave and also my micro wave spectrum, all this from a small booklet sold at Radio Shack stores in the late 80's. Is there anyone in our electronics world that can help me out??, thank you, Michael C.