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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
The bulb has been blackening for some time and almost all of the energy output is in infrared, in the end the protective glass got so hot that it cracked. The large piece of glass was still in the air when I turned around to see what was going on so it must have jumped quite high, it landed almost exactly where it was launched from.
Registered Member #188
Joined: Thu Feb 16 2006, 05:18PM
Location:
Posts: 67
That happened with a 300w halogen lamp. The Lamp actually was rated for 500w but the 500w lamps burn out far too quickly so i used 300w which last much longer and run cooler.
Hot glass was found at the other end of the room, over 5m away and burned various plastic objects. Luckily i was in another room at the time this happened, looking for new batteries for the camera.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Wow, that top lamp is one of those small halogens? I have just, literally the other day replaced one of those in my desklamp which also faces upwards like that and was also going black. Any idea why it goes black? The other halogen bulbs I replaced at the same time still looked like new, it was just that one that was black!
Here's 2 of the bulbs I replaced, both have had about the same usage. I was puzzled by the black one, but I think I'm glad I replaced it!
(If you're wondering why I replaced working bulbs, I was downgrading to 10 watt-ers)
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
I read some where that those halogen lamps cause mroe fires then any other lamp you can buy. I love the spotlight kind (rectangle ones) for working outdoors at night but I wont use them in the house.
Registered Member #121
Joined: Fri Feb 10 2006, 12:39PM
Location: Bromley, UK
Posts: 10
Could it be that the bulbs have been contaminated by greasy fingers? I'm always told and read not to touch them with bare hands as the grease (or something) reacts with the glass which could make it go black, I suppose the glass could be weakened and or the black absorbs a lot more heat.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
Ha I have that EXACT same lamp Bjorn!! I'd better be careful.
I agree with Stove Cenner (when did that change?) in that its probably not hot enough for the actual halogens to do their job - maybe the voltage in your area is lower than spec?
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Lamp failure
I have just, literally the other day replaced one of those in my desklamp which also faces upwards like that and was also going black. Any idea why it goes black? The other halogen bulbs I replaced at the same time still looked like new, it was just that one that was black!
