Brian Posted February 11, 2007 Share Posted February 11, 2007 In the last few weeks we've seen some more 'How bright are LED PAR can' questions so, armed with an empty venue and a pile of kit, I've been doing some real measurements.Subject 1...Stairville PAR 64 LED can with 151 leds. Method...Can was 1000mm from a flat surface. Lux measurements made with incident light meter set to 2870K. Results... R 120 luxG 640 luxB 60 luxR+G+B 738 lux Beam Angle - Horizontal, 50% = 28 degrees, 10% = 50 degreesBeam Angle - Vertical, 50% = 26 degrees, 10% = 48 degrees Notes...There is a huge variation in beam angle between the colours causing significant colour fringing. Blue had the narrowest angle and red the widest. Subject 2...PAR 56 MFL in short nose can. Method...as above. Results... R 2560 luxG 2140 luxB 1620 luxOpen 17800 lux Beam Angle - Horizontal, 50% = 20 degrees, 10% = 30 degreesBeam Angle - Vertical, 50% = 14 degrees, 10% = 28 degrees Notes...Red was Lee 106, Green was Lee 139 and Blue was Lee 132.Conclusion... left as an exercise for the reader :( Link to comment Share on other sites More sharing options...
paulears Posted February 11, 2007 Share Posted February 11, 2007 Nice one Brian. I must admit the difference has shocked me a little. I'd been quite happy that they were dimmer, by quite a long way, but the numbers are interesting to say the least. Link to comment Share on other sites More sharing options...
vx2000 Posted February 11, 2007 Share Posted February 11, 2007 Thanks Brian, Not so much on this forum, but on many others I'm constantly hearing how some LED PARS, such as the Weidmark equals PAR56 or greater output. I measured the Weidmark PAR (full RBG @ 3 meters =~ 200 LUX). At least 10 to 20 TIMES less output than a PAR56 (300W) The 36 LED 1 Watt fixtures are better, but still no where near the output. Not to mention, they are expensive ! Link to comment Share on other sites More sharing options...
MarcT Posted February 11, 2007 Share Posted February 11, 2007 Brian - just for completeness, what lamp was in your PAR 56? Marc Link to comment Share on other sites More sharing options...
johnhuson Posted February 11, 2007 Share Posted February 11, 2007 Compare that to the quoted figures for a Thomas PixelPar 90 at 1000mm (though doesn't give any setting for light meter) which are:- Red - 8158 LuxGreen - 16136 LuxBlue - 1830 LuxWhite - 23460 Lux In fairness it does have a narrower beam angle to the 'budget' units, but you can see why the list price is over 20 times more! Link to comment Share on other sites More sharing options...
Brian Posted February 11, 2007 Author Share Posted February 11, 2007 Brian - just for completeness, what lamp was in your PAR 56?GE, 240v 300W MFL Link to comment Share on other sites More sharing options...
niclights Posted February 11, 2007 Share Posted February 11, 2007 @John: I don't think your edit was enough - is closer to 40x more to bring things into perspective. Great figures Brian. I don't think they come as so much of a surprise. I presume you use L132 as opposed to, say, L119 for transmission on a 300W lamp? Link to comment Share on other sites More sharing options...
johnhuson Posted February 11, 2007 Share Posted February 11, 2007 @John: I don't think your edit was enough - is closer to 40x more to bring things into perspective. Too true I was think of the prices in Euro's on Thomann not Pounds! Link to comment Share on other sites More sharing options...
Brian Posted February 11, 2007 Author Share Posted February 11, 2007 I presume you use L132 as opposed to, say, L119 for transmission on a 300W lamp?It's more what I had. I wanted to use 120 but couldn't find any. Link to comment Share on other sites More sharing options...
JMC Posted February 12, 2007 Share Posted February 12, 2007 It's hardly a shoot out is it.... more of a drive by! Link to comment Share on other sites More sharing options...
niclights Posted February 12, 2007 Share Posted February 12, 2007 But this does not mean they don't have their place ;) Link to comment Share on other sites More sharing options...
scjb Posted February 12, 2007 Share Posted February 12, 2007 Great to have some figures at last! Thanks Brian. Link to comment Share on other sites More sharing options...
Rocket Posted February 12, 2007 Share Posted February 12, 2007 Interesting figures, cheers for those. Like said, I know they're dimmer and had kind of accepted it....but those figures have still really surprised me! Link to comment Share on other sites More sharing options...
lonfire Posted February 12, 2007 Share Posted February 12, 2007 my contacts in china have said they'll do some comparisons of their 24x1w and their new 24x3w led parcans, but because if chinese new year everybody has shut down!! will have to wait for them I'm affraid.. cheers for the data anyhow.. rgdschris Link to comment Share on other sites More sharing options...
Brian Posted February 12, 2007 Author Share Posted February 12, 2007 my contacts in china have said they'll do some comparisons of their 24x1w and their new 24x3w led parcans, but because if chinese new year everybody has shut down!! will have to wait for them I'm affraid..If they are going to provide figures then please can they be done properly? I've been looking at figures for many far east LED products and have yet to find any that are done properly. At the very least, to make sensible comparisons, you need figures similar to the ones I posted. Link to comment Share on other sites More sharing options...
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