200 Pair Fireworks Glasses for Laser Shows, Raves & Holiday Lights - Enhance Light Displays at Parties, Concerts & Festivals

I used these for a science presentation. I speak at a planetarium and was recently asked to do a presentation to middle school science students to learn about spectroscopy (part of a larger presentation on stars). Initially I have them look at a simple tungsten light bulb (I used the type used in fish tanks & display cases because it has a long straight filament that creates a very bold spectrum.) I then move them to other types of lights... showing them hydrogen gas tubes, helium gas tubes, nitrogen gas tubes, etc. and the glasses show off the emission lines of the gases extremely well. At the end of the presentation I tell the students they get to keep the gasses and can look at holiday lights, but also to look at street lights (since they're not tungsten) and notice the different light patterns created by different types of street lights. The presentation was a huge hit.The diffraction grating lenses create hexagonal diffraction spikes. They're durable enough for the purpose. The cardboard frames have a few crease points for different width heads (e.g. adults vs. children).