Measuring and Reporting LED Life

We're putting the finishing touches on a lighting design and as we look at cut sheets we continue to be disappointed that many fixture manufacturers still don’t seem to understand the proper methods of measuring and reporting LED life. For example, an Edison Price cut sheet says that lamp life is “rated 50,000 hours based on L70/B50 criteria.  LM80 report by the LED manufacturer furnished upon request,” a USAI cut sheet says that life is “Based on IESNA LM80-2008 50,000 hours at 70% lumen maintenance (L70),” and a Lighting Services Inc. cut sheet just says “Tested to LM79 and LM80 Protocols” and then gives a life of 50,000 hours. Unfortunately, these statements don’t mean what the manufacturers suggest they mean. Let’s take a look.

Why Hire A Designer?

We’ve had several people call this year to ask, “Why should I hire Studio T+L when the local sales rep/distributor has offered to do the work?” In one instance the caller was an interior designer we’ve worked with before who wanted help in explaining the role of a lighting designer to a client. In another, it was the client of an architect who was urging that we be brought on board as a theatre consultant. In all cases the owner was looking to save money, and saw adding another consultant to the design team as a potential waste of money. Nothing could be further from the truth.

Edison Price "Light In Action"

A former student of mine who works for Edison Price Lighting is organizing a group of seminars they're calling "Light In Action."   It takes place here in NYC at EPL's showroom and factory, and includes demonstrations of lighting techniques, discussions on the future of LEDs (led by a representative from Xicato) and dimming LEDs (led by a representative from eldoLED), as well as a factory tour.   Sounds fun, right?  There are six dates between now and the end of the year.  Visit EPL's web site for more information.

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