The British Caving Association

Any views expressed are not necessarily those of the BCA
It is currently Tue 17 Oct 2017 04:44

All times are UTC [ DST ]




Post new topic Reply to topic  [ 1 post ] 
Author Message
PostPosted: Thu 25 Feb 2010 14:57 
Offline
User avatar

Joined: Thu 16 Mar 2006 23:45
Posts: 457
White power LED achieves 200 lumen per watt

This snippet is from the e-newsletter of Elektor magazine. http://elektor.com Fri, 19 Feb 2010.

Cree, Inc. announces another industry-best reported efficacy record of 208 lumens per watt for a white power LED. Cree’s tests confirmed that the LED produced 208 lumens of light output and achieved 208 lumens per watt efficacy at a correlated color temperature of 4579 K. The tests were conducted under standard LED test conditions at a drive...
Read more http://dbaseserver.mistermail.nl/t/7677 ... /194635/0/

To put this in context, a 4W 'Oldham' style caplamp would probably produce around 40 lumens at around 10 lm/W. So if you are happy with a 40 lumen light source, this new LED would draw around 200 mW and so a single recharegable AA NiMH 'hybrid' cell (2100 mAh) would last around 12 hours.
.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC [ 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:  
cron
Powered by phpBB® Forum Software © phpBB Group