Menu 0

Sorry, Your Browser Is Not Supported

You can still browse the site but some services may not work properly. This site requires Google Chrome, Firefox, Safari or Internet Explorer 10 and above. For mobile devices use an HTML5 capable browser.

Download Chrome

ENERGY STAR TM-21 Calculator Now Available

The ENERGY STAR TM-21 Calculator is based on the Illuminating Engineering Society’s TM-21-11: Projecting Long Term Lumen Maintenance of LED Light Sources, referenced in the ENERGY STAR Luminaires V1.1 specification and in Draft 1 of the ENERGY STAR Lamps V1.0 specification. The Calculator is available for download on