Here is a fascinating find for future techies: a video about how various light bulbs work. Because it begins with the incandescent bulb, it covers a bit of history of the light bulbs. It concisely and creatively describes how halogen lamps, fluorescent bulbs, metal halide vapor lamps, and LED bulbs work. It makes a high-energy enrichment to your STEM lessons. Follow it with some hands-on activities with LED bulbs in circuits or by assigning it some further research on the different types of bulbs.