We found out this year that our students could not understand light at all. We had a pre-questionnaire in which we asked them about radiowaves, how their eyes perceived light, colors, etc. Once we had them fill out the questionnaire we talked about light and straightened out their many misconceptions. Then we edited our old flame lab to include examples of lightbulbs and fluorescent bulbs and even looked at some spectral images of different stars and the absorption and emission lines. It made them get the lab much better.