Broke out my Sunmaster 400W MetalHalide bulb the other night in a bid to get ready for some pre-spring sproutin.

I noticed the inner bulb has accumulated a white phosphorous like coating on the top and bottom thirds of the structure, but everything else within the glass (wires, fuse, etc) seem fine. Is that build up normal?

I plugged it into my Lumatek digital and sure enough it began it's incremental fire-up like everything was fine. This ballast will supposedly remain off if there is a problem detected with the bulb.

Anyone else experienced this before? Is this something I should be worried about?


tia!
BlueDevil Reviewed by BlueDevil on . Yikes. Is this normal for a MH bulb? Broke out my Sunmaster 400W MetalHalide bulb the other night in a bid to get ready for some pre-spring sproutin. I noticed the inner bulb has accumulated a white phosphorous like coating on the top and bottom thirds of the structure, but everything else within the glass (wires, fuse, etc) seem fine. Is that build up normal? I plugged it into my Lumatek digital and sure enough it began it's incremental fire-up like everything was fine. This ballast will supposedly remain off if there is Rating: 5