How to measure brightness of LED?

william chan

A lot of LED manufacturers claim 15,000 to 20,000 mcds for a typical 5mm super bright white led.

Is there a easy, low cost way to verify their claims?

Thanks.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
www.fd.com.my
www.mercedes.com.my

PJAllen

It's called a photometer.· Basically easy to use.· As for "low cost", there's the "you get what you pay for" angle.·

Perhaps there is a way to... http://forums.parallax.com/showthread.php?p=722589


Post Edit -- I bought one of these, a year or two back; "it works pretty good":
·
http://cgi.ebay.com/4in1-Digital-Thermometer-Light-Humidity-Sound-Meter-NEW_W0QQitemZ190224459479QQihZ009QQcategoryZ73162QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Have a look at "Light & Lux Meters" and you can find other units that cost a lot less than this (under $20.)

Post Edited (PJ Allen) : 5/25/2008 11:04:11 PM GMT

william chan

How do you convert Lux to MCDs and then to Lumens?

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
www.fd.com.my
www.mercedes.com.my

Franklin

http://www.theledlight.com/lumens.html·and
http://www.gizmology.net/LEDs.htm
should help.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
- Stephen