LED-How to tell the real ligthing output of led lights?How t

Had a play with something interesting? Got something that we all covet? Found a real lemon? Write a few lines about it, and share your experiences.

Moderator: Moderators

Forum rules
Please ensure that you have a meaningful location included in your profile. Please refer to the FAQ for details of what "meaningful" is.

LED-How to tell the real ligthing output of led lights?How t

Postby haring on Thu Jan 14, 2016 1:52 am

I am looking at several led light options. Obviously, one of the considerations is how much light the led panel emits.
Some companies list their products specifying out put via "lux"
http://www.adorama.com/fpvl500c.html
Others list Watt, W.
http://ikancorp.com/productdetail.php?id=998
Others use lumens...

My questions: How to measure/compare the lighting output of led lights? Is there a way to convert these numbers? All I want to know how much light these lights output so I can compare them.
User avatar
haring
Member
 
Posts: 163
Joined: Tue Feb 15, 2011 2:25 pm
Location: Miami, Florida

Re: LED-How to tell the real ligthing output of led lights?H

Postby Mr Darcy on Thu Jan 14, 2016 7:18 am

Watts measure the amount of power the device uses. It has no direct bearing on the light output as other factors like efficiency come into play. It is mainly used as a comparison to old tungsten lighting to say "Look how good we are"

Lux is the the measure of the light output of the device and is the correct figure to use in this instance

Lumens is the amount of light illuminating the subject, and while this is the figure you should be most interested in, it has no relevance to a lamp sitting in a box on the shelf in a store. It is dependent on distance to subject, albedo of subject and angle of spread of the output.

To convert Lumens to Lux (or vice versa) try this: https://www.ledrise.com/shop_content.php?coID=19

You should also be interested in the CRI figure. This is an indicator of the quality of the light. It should be as close to 100 as you can get.
Greg
It's easy to be good... when there is nothing else to do
User avatar
Mr Darcy
Senior Member
 
Posts: 3414
Joined: Thu Oct 26, 2006 11:35 pm
Location: The somewhat singed and blackened Blue Mountains


Return to Equipment Reviews

Who is online

Users browsing this forum: Majestic-12 [Bot] and 33 guests

cron