Usable Light Tool 2.2

High-power LED datasheets publish typical flux and other performance values at a lab controlled junction temperature of 25°C.  As such, it is difficult to determine the expected level of usable light in a "real world" environment.

The purpose of this tool is to provide a true "real world" evaluation and comparison of high-power LEDs by taking into account the effects of 7 critical relationships.

For more details, click the links to read the ULT 2.x Tutorial and view the ULT 2.x Demonstration Video.

Enter your username and password to sign into the Usable Light Tool:
(you may also use your SSL Designer or Driver Selector Tool Account to login)

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For questions/comments or if you would like to carry out an analysis with other LED manufacturers, please contact your local Future Electronics branch or send an email to  Please review disclaimer.