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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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Possible Lighting Problem
Hi,
In my kitchen I have just in the process of installing four recessed eye ball down lights. These are the mains GU10 type. They are laid out in a square box shape with each fixture on a corner if you see what I mean. Anyway, after looking at the instructions for the fittings it states the minimum distance for any object *in front* of the light before I presume the heat could cause a fire. This is fine as they are mounted in the ceiling. However, one hole is reasonable close, I would say 10 to 15 cm to a copper pipe and some mains cable that runs through the ceiling void. So I put that fixture in and ran it for around 5 minutes, I then removed it, shut off the power and had a feel around in the hole to see if anything was heating up and it wasnt. I then repeated the process up to 30 minutes running time and the cables and pipe didnt feel warm at all. So is the opinion on this that the fixture will be safe or am I running the risk of setting my ceiling void on fire and burning down my house. I guess the question is can dangerous levels of hear occur behind the fixture and is there a safe distance or a minimum amount of void that these things should be mounted in. Thanks for the on going help. CM. |
#3
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Possible Lighting Problem
In article ,
Martin Angove writes: It is important however to realise the difference between GU10 and GZ10 laps which otherwise look similar and will fit the same connector bases. They don't have same bases -- full reflector base has a bevel round the bottom which stops dichroic lamps being fitted. Substituting the other way round is OK. This is specifically to stop a dichroic lamp being used in a fitting not designed to take the heat it dumps backwards. -- Andrew Gabriel |
#4
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Possible Lighting Problem
In message ,
(Andrew Gabriel) wrote: In article , Martin Angove writes: It is important however to realise the difference between GU10 and GZ10 laps which otherwise look similar and will fit the same connector bases. They don't have same bases -- full reflector base has a bevel round the bottom which stops dichroic lamps being fitted. Substituting the other way round is OK. This is specifically to stop a dichroic lamp being used in a fitting not designed to take the heat it dumps backwards. Ok, I stand corrected. The point was valid though as many fittings are designed for use with either, and the user may not be aware of the extra problems with rearward heat build-up when installed in a confined space. Hwyl! M. -- Martin Angove: http://www.tridwr.demon.co.uk/ Two free issues: http://www.livtech.co.uk/ Living With Technology .... Some Do, Some Don't, Some Will and Some Won't. |
#5
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Possible Lighting Problem
From memory, they are not to be covered with insulation, and at least
50mm (i.e. 5 cm) from any potentially flammable surface so I would have thought that 100mm or 150mm would be fine, but check the instructions in case the advice is different for yours. Had another look at the instructions and nothing mentioned about the heat from the top of the units. Ive done some more tests today and they seem to be fine and there is no excess heat build up in the ceiling. It is important however to realise the difference between GU10 and GZ10 laps which otherwise look similar and will fit the same connector bases. One (GU10?) is dichroic and the other is a simple reflector. A simple snip Thanks for the info on that - I wasn't aware of that. CM. |
#6
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Possible Lighting Problem
In message ,
"Charles Middleton" wrote: From memory, they are not to be covered with insulation, and at least 50mm (i.e. 5 cm) from any potentially flammable surface so I would have thought that 100mm or 150mm would be fine, but check the instructions in case the advice is different for yours. Had another look at the instructions and nothing mentioned about the heat from the top of the units. Ive done some more tests today and they seem to be fine and there is no excess heat build up in the ceiling. I've just found the instruction leaflet for mine - Aurora downlighters from Screwfix (p163, 19324). The dimensions given are 135mm height - i.e. in total from ceiling to nearest obstacle above, and 75mm *from spring mount* to nearest vertical obstacle. The diagram shows a lamp almost completely enclosed in a box of these dimensions though :-) Hwyl! M. -- Martin Angove: http://www.tridwr.demon.co.uk/ Two free issues: http://www.livtech.co.uk/ Living With Technology .... If I want your opinion I'll beat it from you |
#7
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Possible Lighting Problem
"Martin Angove" wrote in message ... I've just found the instruction leaflet for mine - Aurora downlighters from Screwfix (p163, 19324). The dimensions given are 135mm height - i.e. in total from ceiling to nearest obstacle above, and 75mm *from spring mount* to nearest vertical obstacle. The diagram shows a lamp almost completely enclosed in a box of these dimensions though :-) Thinking about it what I didn't (foolishly) consider was the distance from the fixture to the joist - its quite close. What's the heat tolerance of a ceiling joist and how hot can these fixtures get? Has anyone known of these units setting fire to things before - I imagine its a distinct possibility! I'm starting to get a little concerned about the set up now - I would want to have an fire in the void between my ground and 1st floor! CM. |
#8
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Possible Lighting Problem
In article , Charles Middleton
writes "Martin Angove" wrote in message ... I've just found the instruction leaflet for mine - Aurora downlighters from Screwfix (p163, 19324). The dimensions given are 135mm height - i.e. in total from ceiling to nearest obstacle above, and 75mm *from spring mount* to nearest vertical obstacle. The diagram shows a lamp almost completely enclosed in a box of these dimensions though :-) Thinking about it what I didn't (foolishly) consider was the distance from the fixture to the joist - its quite close. What's the heat tolerance of a ceiling joist and how hot can these fixtures get? Has anyone known of these units setting fire to things before - I imagine its a distinct possibility! I'm starting to get a little concerned about the set up now - I would want to have an fire in the void between my ground and 1st floor! I think you are worrying unnecessarily. You would have to try quite hard to start a fire with a LV downlighter. You certainly would not be able to set light to a ceiling joist with one even if it was touching. A lot of the clearance measurements are to give cooling to keep the lamp life reasonable. -- Tim Mitchell |
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