Looks like there are a lot more LED GU10 LED lamps now on the market designed to replace mains or LV GU10 halogen [ http://www.tlc-direct.co.uk/Products/GULEDW.html]
Data sheets typically give LED power output in watts but not lumens. LEDs emit around 50-80 lumens per watt. So for say this 1.6 watt LED from TLC, I'm only gonna get 75-125 lumens.
If I take a 35w mains halogen lamp, I will get around 600 lumens. So my back of the envelope estimates indicate that I need 5 or 6 LEDs to 1 halogen - in other words, for an existing installation there is bound to be a very big drop in illuminance (and by inference, LEDs should just be used for effect/highlighting)
Q1 - is the theory correct?
Q2 - in practice, has anyone actually had experience of replacing a bunch of GU10 halogen downlighters with LED GU10s?
PS this forum
[/ http://www.candlepowerforums.com/vb/showthread.php?t=89607 ] is where it gets really down and dirty ...
Data sheets typically give LED power output in watts but not lumens. LEDs emit around 50-80 lumens per watt. So for say this 1.6 watt LED from TLC, I'm only gonna get 75-125 lumens.
If I take a 35w mains halogen lamp, I will get around 600 lumens. So my back of the envelope estimates indicate that I need 5 or 6 LEDs to 1 halogen - in other words, for an existing installation there is bound to be a very big drop in illuminance (and by inference, LEDs should just be used for effect/highlighting)
Q1 - is the theory correct?
Q2 - in practice, has anyone actually had experience of replacing a bunch of GU10 halogen downlighters with LED GU10s?
PS this forum
[/ http://www.candlepowerforums.com/vb/showthread.php?t=89607 ] is where it gets really down and dirty ...