Checking light shift with a Prism??

[cyberwollf]

I was talking to someone a while back who said they had read something on the ablity to check for spectrum shift in bulbs with a prism.  Technically it makes sense, but i dont know how you would remember a picture of the "control" spectrum of a new bulb or how easy it would be to differentiate.   

Has anyone read anything on this, i couldnt find anything on google.  Sounds plausible, and would be great to change bulbs when they actually shift vs every X months, and waste bulb life

[jungliztkruger]

i would imagine if you looked through the prism and saw more red than you did after the bulb burned in that would mean the spectrum is starting to shift

[Baggerhog]

You can buy a spectrum meter on ebay pretty cheap. I have one that I bought from Sean Dankin a while back. He said he bought it on ebay. It is very easy to use.

[wolfeden3]

It was me Wes that you were talking to about using a prism to see what the spectrum is. It does work if you know what you are looking for. look up a light spectrum chart to find out what the bulbs are supposed to be then look through the prism see if the color is the same or how different. that is a very easy way to see if you need a bulb change or not!!

[rayviv]

What kind of prism exactly are you referencing?