DIY Forum


Ultimate HandymanUltimate Handyman on Pinterest


DIY Forum/Home improvement advice forum




It is currently Tue Oct 23, 2018 5:35 pm
Visit Hilti

Time zone: Europe/London [ DST ]



Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: LED spotlights
PostPosted: Sun Oct 08, 2017 2:28 pm 
Senior Member

Joined: Mon Jan 16, 2006 8:16 pm
Posts: 5971
Location: Somerset
Has thanked: 98 times
Been thanked: 351 times
Looking for some recomendations...
Loft 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.

Why isn't the number 11 pronounced onety one?

Share on FacebookShare on TwitterShare on DiggShare on DeliciousShare on Google+
Reply with quote  
 Post subject: Re: LED spotlights
PostPosted: Mon Oct 09, 2017 9:22 pm 
Senior Member
User avatar

Joined: Fri Feb 26, 2010 11:16 am
Posts: 1775
Location: Camberley Surrey
Has thanked: 101 times
Been thanked: 301 times
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.

Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 



Similar topics

Time zone: Europe/London [ DST ]

Who is online

Users browsing this forum: No registered users and 1 guest

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Visit Solent plastics




News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list
ultimatehandyman privacy policy



Powered by phpBB® Forum Software © phpBB Group