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I have a very old mercury vapor bulb that finally burnt out after at least 20 years. I'm having quite the time replacing it.

I took the bulb to Home Depot to find a replacement. I found two, but I can't figure out which of the two I need. Both are Philips brand.

- The first is a 250w that fits a ANSI H37 ballast.
- The second is a 175w that fits a ANSI H39 ballast.
- Both bulbs have the same size metal base.

The actual bulb says nothing about wattage or recommended ballast size. On the metal base, it has a long series of letters and "1234567890."

The ballast itself...I cannot find anything on it that says what wattage/ballast size.

I'm pretty much at a standstill...obviously I don't want to use the wrong bulb and cause a fire or God-knows-what. Free coffee to anyone that can help!:vs_coffee:
 

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Semi-Pro Electro-Geek
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3,403 Posts
Definitely just bypass the ballast and use an LED. There is no good reason to put another mercury vapor bulb in there.
 
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