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A 48-page pdf booklet on light from Deakin University. Lots of activities and question sheets - a really good introduction to the topic.

In this article, we discuss some common misconceptions about light, heat, and the sun. We also provide tools for formative assessment and ideas for teaching the correct scientific concepts. Most of the examples are aimed at elementary students but many are appropriate for middle school students as well.

Students hold lots of misconceptions about the light and heat.

Seven activities to do with a radiometer. Of course, you need a radiometer - a radiometer is a light bulb-shaped device containing an object that looks like a weather vane (wings arranged in a circle like spokes of a wheel).  Developed to measure the intensity of radiant energy, or heat (from the site)