LED Downlighters

16 Apr 2007
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United Kingdom
Client wants LED downlights in a kitchen & bathroom. They give a very different type and spread of light so I find estimating numbers for a given area difficult. LV halogens or GU10 halogens or CFL are much easier.

Is there any guide to the spacing of fittings to get a known lux level? Or a rule of thumb? For example I tend to use a 1200mm grid when clients want 35/50W halogen downlighters.

I'm thinking about standard mains GU10 (60mm hole size) fire rated downlighter bodies with GU10 1.8W LED lamps with 20 LED's in them.

They will also have LED undercabinet lights probably 0.12W triangular undercabinet light fittings - any ideas on spacings of these along a run of cabinets to provide a good working light - I'm thinking 400-500lux.
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Has your customer actually seen these lights? If he/she is under the impression that they are as good as halogens but lower energy then there might be a problem when it comes to paying your invoice!

Based on my own experimentation I would suggest that you would certainly need to halve the spacing that you normally use with halogens.
Demonstrated GU10 halogen; GU10 LED & GU10 CFL - customer prefers LED. Discussed the error of their ways at length but the customer is getting what the customer wants - loads of LED's - but I'm going to use 12v LEDs and massively overspec the trannies so when they finally realise how dark it is they can swop over to 12v halogens and finally see the error of their ways!!

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