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 Post subject: LED spotlights
PostPosted: Sun Oct 08, 2017 2:28 pm 
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Looking for some recomendations...
Loft conversion...room about 5m x 3m

Its been spec'd that 75% of the new lights have to have efficiency more than 40/lumens per circuit watt... :wtf:

I'm thinking a row of LED spotlights, with a 90degree spread... Maybe 4 or 5 along the centre? (flat section of ceiling about 1m wide)
But what wattage/voltage etc...does that have a bearing on efficiency? I assume any LED fittings are efficient...
Dimmable would be nice, but not essential.


Probably the same setup in the other bedroom (sorry, wife's libary :lol: ), slightly smaller room.

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 Post subject: Re: LED spotlights
PostPosted: Mon Oct 09, 2017 9:22 pm 
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Most boxed GU10 LED will have their wattage and lumens and most will easily exceed 40/1watt. Finding a 90* might be a task.
This is a good general info for dimmers:
All dimmer switches have a minimum and maximum rating (Watts). Unfortunately LED loading cannot be calculated the same way as a traditional incandescent or a mains halogen light bulb. A good rule of thumb to apply - is to take the maximum rating of the dimmer switch and divide by 10 (or in other words use 10% of the max. rating). Eg: - if you have a dimmer switch with a maximum rating of 400W (rule of thumb translates to 40W) you can run five 8W dimmable LED light bulbs however the 40W must still be above the minimum rating of the dimmer switch!.
Dimming LED bulbs with a trailing edge dimmer which generally are more suited and lower wattage as they use a sophisticated electronics with benefits from silent operation to smoother control. They also generally have a lower minimum load than leading edge (old style) dimmers, which is why they’re better suited to the more modest wattages associated with LED bulbs.


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