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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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GU10 Dichroic Reflector confusion
I notice that on the Screwfix website some of the mains voltage GU10
halogen lamps are described as having a "dichroic reflector". Does anyone know what "dichroic reflector" means in this context? I had assumed the term dichroic just applies to lamps with the GZ10 style cap which direct any heat towards the back of the lamp, as opposed to lamps with the GU10 style caps which direct any heat towards the front of the lamp. Now seeing GU10 halogen lamps described as having a dichroic reflector has confused me somewhat. |
#2
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GU10 Dichroic Reflector confusion
"JA" wrote in message ... I notice that on the Screwfix website some of the mains voltage GU10 halogen lamps are described as having a "dichroic reflector". Does anyone know what "dichroic reflector" means in this context? I had assumed the term dichroic just applies to lamps with the GZ10 style cap which direct any heat towards the back of the lamp, as opposed to lamps with the GU10 style caps which direct any heat towards the front of the lamp. Now seeing GU10 halogen lamps described as having a dichroic reflector has confused me somewhat. Dichroic lamps allow some of heat to pass backwards .. often used in lamps which would put too much heat on object or person it was illuminating (eg PAR 38 spots) I had opposite requirement I wanted non-dichroic lamps for my Low-Voltage down lights as I do no want the heat pushed back into housing .... they over heat & trip transformer. |
#3
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GU10 Dichroic Reflector confusion
On 5 Apr, 10:37, JA wrote:
I notice that on the Screwfix website some of the mains voltage GU10 halogen lamps are described as having a "dichroic reflector". Does anyone know what "dichroic reflector" means in this context? I had assumed the term dichroic just applies to lamps with the GZ10 style cap which direct any heat towards the back of the lamp, as opposed to lamps with the GU10 style caps which direct any heat towards the front of the lamp. Now seeing GU10 halogen lamps described as having a dichroic reflector has confused me somewhat. It must be a misprint , GZ lamps with the chamfered corners are dichroic, GU lamps are aluminsed, fittings are designed one way or other , best not to mix. Cheers Adam |
#4
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GU10 Dichroic Reflector confusion
On 6 Apr, 10:39, "Rick Hughes"
wrote: "JA" wrote in message ... I notice that on the Screwfix website some of the mains voltage GU10 halogen lamps are described as having a "dichroic reflector". Does anyone know what "dichroic reflector" means in this context? I had assumed the term dichroic just applies to lamps with the GZ10 style cap which direct any heat towards the back of the lamp, as opposed to lamps with the GU10 style caps which direct any heat towards the front of the lamp. Now seeing GU10 halogen lamps described as having a dichroic reflector has confused me somewhat. Dichroic lamps allow some of heat to pass backwards .. often used in lamps which would put too much heat on object or person it was illuminating *(eg PAR 38 spots) I had opposite requirement I wanted non-dichroic lamps for my Low-Voltage down lights as I do no want the heat pushed back into housing .... they over heat & trip transformer. Aluminised LV MR16 are very rare, no idea why, mebbe remote the transformer? Cheers Adam |
#5
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GU10 Dichroic Reflector confusion
"Adam Aglionby" wrote in message ... On 6 Apr, 10:39, "Rick Hughes" wrote: "JA" wrote in message ... I notice that on the Screwfix website some of the mains voltage GU10 halogen lamps are described as having a "dichroic reflector". Does anyone know what "dichroic reflector" means in this context? I had assumed the term dichroic just applies to lamps with the GZ10 style cap which direct any heat towards the back of the lamp, as opposed to lamps with the GU10 style caps which direct any heat towards the front of the lamp. Now seeing GU10 halogen lamps described as having a dichroic reflector has confused me somewhat. Dichroic lamps allow some of heat to pass backwards .. often used in lamps which would put too much heat on object or person it was illuminating (eg PAR 38 spots) I had opposite requirement I wanted non-dichroic lamps for my Low-Voltage down lights as I do no want the heat pushed back into housing .... they over heat & trip transformer. Aluminised LV MR16 are very rare, no idea why, mebbe remote the transformer? No problem getting them - I simply order mine from 'Lightbulbs-direct.com' My issue is that house is very well insulated, so no heat escapes upwards ..... and even with t/f 200mm away they still overheated if on for an hour or more. Changed to Phillips Aluminum reflectors (Phillips Pro Alu) and no problem since .. heat goes out through front of lamp rather than through rear. |
#6
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GU10 Dichroic Reflector confusion
On 6 Apr, 14:22, "Rick Hughes"
wrote: "Adam Aglionby" wrote in message ... On 6 Apr, 10:39, "Rick Hughes" wrote: "JA" wrote in message ... I notice that on the Screwfix website some of the mains voltage GU10 halogen lamps are described as having a "dichroic reflector". Does anyone know what "dichroic reflector" means in this context? I had assumed the term dichroic just applies to lamps with the GZ10 style cap which direct any heat towards the back of the lamp, as opposed to lamps with the GU10 style caps which direct any heat towards the front of the lamp. Now seeing GU10 halogen lamps described as having a dichroic reflector has confused me somewhat. Dichroic lamps allow some of heat to pass backwards .. often used in lamps which would put too much heat on object or person it was illuminating (eg PAR 38 spots) I had opposite requirement I wanted non-dichroic lamps for my Low-Voltage down lights as I do no want the heat pushed back into housing .... they over heat & trip transformer. Aluminised LV MR16 are very rare, no idea why, mebbe remote the transformer? No problem getting them - I simply order mine from 'Lightbulbs-direct.com' My issue is that house is very well insulated, so no heat escapes upwards .... and even with t/f *200mm away they still overheated if on for an hour or more. Remote wound trafos, but copper cost can get excessive. Changed to Phillips Aluminum reflectors (Phillips Pro Alu) and no problem since .. heat goes out through front of lamp rather than through rear. Hadn`t encountered them before thanks: http://www.voltimum.co.uk/news/422/s...uminaires.html Cheers Adam |
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