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Which is the coolest lamp?
I heard that GU10 230v lamps throw the heat forwards and other types,
including LV, throw the heat backwards. The forward throwing type is better for fire safety in ceilings. Building inspectors are getting shirty about downlighters in ceilings, wanting fireproof boxes around them. If a lamp throws heat forwards then the fire aspect should not be an issue. Does anyone know what lamps are more safe than others in this respect? |
wrote in message
ups.com... I heard that GU10 230v lamps throw the heat forwards and other types, including LV, throw the heat backwards. The forward throwing type is better for fire safety in ceilings. Building inspectors are getting shirty about downlighters in ceilings, wanting fireproof boxes around them. If a lamp throws heat forwards then the fire aspect should not be an issue. Does anyone know what lamps are more safe than others in this respect? I imagine that the LED downlighters which are a direct replacement for GU10s would be the coolest option, but you need more of them to get the same amount of light. http://www.electriclightcompany.co.u...Lamps_154.html Al |
On Wed, 02 Feb 2005 02:49:37 -0800, timegoesb wrote:
I heard that GU10 230v lamps throw the heat forwards and other types, including LV, throw the heat backwards. The forward throwing type is better for fire safety in ceilings. Building inspectors are getting shirty about downlighters in ceilings, wanting fireproof boxes around them. If a lamp throws heat forwards then the fire aspect should not be an issue. Does anyone know what lamps are more safe than others in this respect? Anything with a dichroic (selective) reflector attempts to throw visible light forward whilst letting infrared pass though it and out the back. One property of dichroic reflectors is they appear "colourful" if you look at them, with little patches of colour depending on how you look at them. I've mostly seen dichroic used on LV halogen (where the reflector is part of the bulb assembly) Timbo |
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On 2 Feb 2005 02:49:37 -0800, wrote:
larva lamps from the 60's, by the way the word is kewl bob |
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wrote
| I heard that GU10 230v lamps throw the heat forwards and other types, | including LV, throw the heat backwards. The forward throwing type is | better for fire safety in ceilings. | Building inspectors are getting shirty about downlighters in ceilings, | wanting fireproof boxes around them. If a lamp throws heat forwards | then the fire aspect should not be an issue. The issue is not so much the heat generated by the lamp. A fireproof box is going to concentrate that heat in a particular area, rather than letting it dissipate through the void. The problem is the fact that the ceiling is being pierced allowing the spread of smoke and fire from the room below into the ceiling void. The plasterboard ceiling is an important part of maintaining the fire integrity of the whole floor structure. These fire domes also have to be used for ceiling speakers, which do not generate any heat. The use of ceramic flowerpots, while useful for keeping loft insulation away from the luminaire, does not preserve the fire integrity of the ceiling. Owain |
Andrew Gabriel wrote:
If you are talking from the perspective of the lamp starting a fire, then a fully aluminised reflector rather than a dichroic reflector lamp would be better, Yup agreed. I would have thought the prospect of the lamp itself being responsible for a fire is limited, since although they get hot, they don't typically get _that_ hot... (250 deg C tops as a guess, which is going to be below the flash point of most building materials). Having said that, if your transformer melts and goes low resistance that might do it ;-) but they've become very hard to find nowadays. I though that most GU10s were typically ali, and GZ10s the dichroic versions? -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
In article ,
John Rumm writes: Andrew Gabriel wrote: If you are talking from the perspective of the lamp starting a fire, then a fully aluminised reflector rather than a dichroic reflector lamp would be better, Yup agreed. I would have thought the prospect of the lamp itself being responsible for a fire is limited, since although they get hot, they don't typically get _that_ hot... (250 deg C tops as a guess, which is going to be below the flash point of most building materials). Having said that, if your transformer melts and goes low resistance that might do it ;-) There have been cases. Two I know of were both due to bad lampholder connections -- in one case the lampholder started a fire and in the other case it shorted out and the transformer then started the fire. but they've become very hard to find nowadays. I though that most GU10s were typically ali, and GZ10s the dichroic versions? Yes, you're right (although I can never remember which way round they are without looking it up). I was thinking of the 12V lamps, where fully aluminised reflectors used to be available, but have vanished now. -- Andrew Gabriel |
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No-ones really answered the question, least not the way I read it... my answer is CFLs. You could also say LEDs, but theyre not a serious contender practically. I think the asnwer is there is not much to choose between them. It is the cutting of the hole that posses more risk than the choice of lamp. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
"Owain" wrote in message ... wrote | I heard that GU10 230v lamps throw the heat forwards and other types, | including LV, throw the heat backwards. The forward throwing type is | better for fire safety in ceilings. | Building inspectors are getting shirty about downlighters in ceilings, | wanting fireproof boxes around them. If a lamp throws heat forwards | then the fire aspect should not be an issue. The issue is not so much the heat generated by the lamp. A fireproof box is going to concentrate that heat in a particular area, rather than letting it dissipate through the void. The problem is the fact that the ceiling is being pierced allowing the spread of smoke and fire from the room below into the ceiling void. The plasterboard ceiling is an important part of maintaining the fire integrity of the whole floor structure. These fire domes also have to be used for ceiling speakers, which do not generate any heat. The use of ceramic flowerpots, while useful for keeping loft insulation away from the luminaire, does not preserve the fire integrity of the ceiling. An upturned ceramic pot with notch out of the rim for the cable and sealed with silicon to the plasterboard with preserve fire integrity. _________________________________________ Usenet Zone Free Binaries Usenet Server More than 120,000 groups Unlimited download http://www.usenetzone.com to open account |
"Doctor Evil" wrote in message ... "Owain" wrote in message ... wrote | I heard that GU10 230v lamps throw the heat forwards and other types, | including LV, throw the heat backwards. The forward throwing type is | better for fire safety in ceilings. | Building inspectors are getting shirty about downlighters in ceilings, | wanting fireproof boxes around them. If a lamp throws heat forwards | then the fire aspect should not be an issue. The issue is not so much the heat generated by the lamp. A fireproof box is going to concentrate that heat in a particular area, rather than letting it dissipate through the void. The problem is the fact that the ceiling is being pierced allowing the spread of smoke and fire from the room below into the ceiling void. The plasterboard ceiling is an important part of maintaining the fire integrity of the whole floor structure. These fire domes also have to be used for ceiling speakers, which do not generate any heat. The use of ceramic flowerpots, while useful for keeping loft insulation away from the luminaire, does not preserve the fire integrity of the ceiling. An upturned ceramic pot with notch out of the rim for the cable and sealed with silicon to the plasterboard with preserve fire integrity. You'll have to get the silicon VERY hot to melt it enough to make it nice and sticky ;-) and to remain on topic, I recenly tried out the little 7W GU10-compatible fluorescents to replace 5xmains 50W downlighters in the kitchen. VERY disappointing - the halogens are back in and the mini fluorescents are doing a great job in my study. Regards, Simon. |
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"Simon Stroud" writes: and to remain on topic, I recenly tried out the little 7W GU10-compatible fluorescents to replace 5xmains 50W downlighters in the kitchen. VERY disappointing - the halogens are back in and the mini fluorescents are doing a great job in my study. Multiply 7W by 4 to get equivalent, and in this case knock a bit off due to reflector losses and comparison with 12V rather than 240V lamps, and you're probably looking at 20-25W equivalent, so it's not surprising it fell short of 50W lamps. -- Andrew Gabriel |
"Al Reynolds" wrote in message ... wrote in message ups.com... I heard that GU10 230v lamps throw the heat forwards and other types, including LV, throw the heat backwards. The forward throwing type is better for fire safety in ceilings. Building inspectors are getting shirty about downlighters in ceilings, wanting fireproof boxes around them. If a lamp throws heat forwards then the fire aspect should not be an issue. Does anyone know what lamps are more safe than others in this respect? I imagine that the LED downlighters which are a direct replacement for GU10s would be the coolest option, but you need more of them to get the same amount of light. http://www.electriclightcompany.co.u...mpany_LED_GU10 _Lamps_154.html Al Has anyone ever used these? Any reports? Light? Type of light? etc? _________________________________________ Usenet Zone Free Binaries Usenet Server More than 120,000 groups Unlimited download http://www.usenetzone.com to open account |
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