Light fixture exploded

[JediMasterThrash]

While I was working out downstairs in the morning, my wife said she'd heard what sounded like me coughing, and thought nothing of it.Later, as we were getting ready for work, she complained about the weird "burning rubber" smell in the kitchen. I could smell it too, but only in a few places in the kitchen (probably from the way air-drafts were going).When I could find a spot where I smelt it, it was a pretty solidly a burning electronics smell (being an engineer, I've burnt or blown up enough electronics in my day to know that smell). I was quite concerned, and checked all the appliances and everything looking for where the smell could have come from. Garbage?Then I checked the crab tank, and noticed that the rear light fixture was off. The flourescent light and rear moonglo fixture are on day/night timers, and turn on in the morning. The flourescent was on, and not the moonglos. I thought maybe the bulbs blew out.But nope. I lifted up the fixture, and smelt quite the strong burning electronics smell. The inside was all splashed with black carbon, like a small firecracker had gone off, and some black scoring on the top of the tank. And the fixture was still plugged in, so I could still smell the warm burning coming out, and hear some weak crackling. No visible smoke though, just all the carbon scoring over the component box in the middle and over the backsplash and over the light bulbs...So, yeah. My light fixture exploded. Seems rather scary if you think about it. What if we hadn't found it. I wonder if it would have been any good if that fixture was sitting there plugged-in, smoldering electronics all day.Well, the storal of the morey is, make sure you're absolutely sure about the wattage rating on your light fixture. This particular light fixture was one I found at the thrift store for 3$. It had no labels whatsoever on it. The light fixture that I bought along with my tank had sticker on it that warned about the 25w bulb maximum limit. So my guess is that the unknown thrift-store fixture might only have been rated for 15w bulbs, and I just never knew it, and eventually the 25w bulbs burned out the electronics.