Dot Laser

How can I tell the difference between spectrums of light?

My science fair is coming up, and I am having difficulties. I'm suppose to compare the differences between spectrums with with different light sources. Please Answer responsibly if possible.

You need a diffraction grating - just possibly you might get an obvious effect from a DVD, used as a reflection grating.

You need - an ordinary , incandescent lamp

An energy saver lamp.

A laser ( any sort will do - use red for safety )

Try LED's .... I have no idea what their spectrum is.

The ordinary lamp will give a straight ROYGBIV rainbow spectrum

The energy saver will look the same but, look carefully and you will see some bands of thicker colour . These are the emission bands of excited mercury. Old fluorescent tubes show them better.
The laser will show a series of single colour dots.... lasers only give out a single frequency so they don't have a spectrum ( a spread ) to show you.

Try LED's.

The best is a neon bulb but that might be difficult to get hold of.

And orange streetlights also produce a different spectrum from the usual.

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