Lamp failure
Bjørn, Thu Sept 07 2006, 06:49PMThe 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.
Re: Lamp failure
robert, Thu Sept 07 2006, 07:14PM
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.
robert, Thu Sept 07 2006, 07:14PM
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.
Re: Lamp failure
Avalanche, Thu Sept 07 2006, 07:54PM
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)
Avalanche, Thu Sept 07 2006, 07:54PM
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)
Re: Lamp failure
Electroholic, Fri Sept 08 2006, 12:49AM
maybe the black one doesnt' has enough/as much halogen?
One thing tho, does anyone know Y there are two flat piece of metal in the base of the bulb?
Electroholic, Fri Sept 08 2006, 12:49AM
maybe the black one doesnt' has enough/as much halogen?
One thing tho, does anyone know Y there are two flat piece of metal in the base of the bulb?
Re: Lamp failure
Nik, Fri Sept 08 2006, 02:04AM
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.
Nik, Fri Sept 08 2006, 02:04AM
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.
Re: Lamp failure
AndrewM, Fri Sept 08 2006, 03:15AM
Careful, or your speakers might shatter too
hopefully i won't be the only one who remembers that.
AndrewM, Fri Sept 08 2006, 03:15AM
Careful, or your speakers might shatter too
hopefully i won't be the only one who remembers that.
Re: Lamp failure
Bjørn, Fri Sept 08 2006, 04:53AM
Bjørn, Fri Sept 08 2006, 04:53AM
wrote ...
One thing tho, does anyone know Y there are two flat piece of metal in the base of the bulb?
They are molybdenum foils that are used to make a perfect gass tight seal with the quartz.One thing tho, does anyone know Y there are two flat piece of metal in the base of the bulb?
Re: Lamp failure
Steve Conner, Fri Sept 08 2006, 11:57AM
I think they go black if they're not running hot enough for the halogen cycle to work. (either through too low voltage or too much cooling)
Steve Conner, Fri Sept 08 2006, 11:57AM
I think they go black if they're not running hot enough for the halogen cycle to work. (either through too low voltage or too much cooling)
Re: Lamp failure
Richy, Fri Sept 08 2006, 07:12PM
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.
Richy, Fri Sept 08 2006, 07:12PM
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.
Re: Lamp failure
Billybobjoe, Fri Sept 08 2006, 08:31PM
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?
Billybobjoe, Fri Sept 08 2006, 08:31PM
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?
Re: Lamp failure
Bjørn, Fri Sept 08 2006, 11:52PM
The lamp has two power settings (35W/50W), maybe the lowest one does not get the temperature high enough.
Bjørn, Fri Sept 08 2006, 11:52PM
The lamp has two power settings (35W/50W), maybe the lowest one does not get the temperature high enough.
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