Neon light bulb

Forums Spectroscopy DIY spectroscope Neon light bulb

Paul Luckas

I’m with Andy. Try imaging the bulb in a completely dark room (ie, with just the Neon lamp turned on) to eliminate other sources of light. If the ‘hump’ is still present, then it may well be the lamp itself.

What are the specifics of the neon “light bulb” you’re using?