How to tell if MH bulb is good or not?


New member
How can you determine how old a Radium MH bulb is? At $90 a clip I want to see if this one is still good before I purchase two new ones? I am cleaning out my equipment rack and found three MH bulbs. The two XM's the filament area is pretty black so I tossed them.

The Radium barely has any black on the edges of the filament and the center looks pretty clean.

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Pitcher Hill Reef Society
Give it a try, and see if you grow nuisance algae or if you grow color lol i cant really recommend any other ways that i know of