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Definitely metal halide, had the correct ballast too. We were just amazed at how the internals crystallized like that. Not sure what caused it.
 

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Weird stuff growing in there. Did you put it in to see if it worked at all?
I'd have to call alto or send a pic to the company to see if they know what it is growing in that Petrie dish.
 

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Looks like the old style mercury vapour lamps ?
Many of the older electricians will be familiur with them !
I don't see a staring electrode or a quartz arc tube. Unless your referring to the vague resemblance?



Definitely metal halide, had the correct ballast too. We were just amazed at how the internals crystallized like that. Not sure what caused it.
Ceramic metal halides fail in strange ways. Ive seen some develop a hole in the arc tube where the gases leak out and the lamp turns brown.
 

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That's a ceramic arc tube rather than quartz. It's the same arc tube material used in HPS lamps. :nerd::nerd: I wonder if that has something to do with it?
 
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