LED House Lights "Flick on"

Andy Haefner

Member
Joined
Feb 23, 2018
Location
USA
Hello, my school recently got a major upgrade and part of that was a transition to LED. Our incandescent house lights were replaced with dimmable LED fixtures. We are faced with a problem however, it seems every time we bring them up at the end of an event (after they have been off for awhile) they have a horrible "flick on" which we can't seem to alleviate, even with an altered dimming curve and a programmed, slow fade up. Does anybody have any tips or strategy's I could try to alleviate this?
 

BillConnerFASTC

Well-Known Member
Joined
Jan 30, 2010
Location
Clayton NY 13624
Im not sure if you have mains dimming lamps or an actual LED fixture with driver which gets constant power and data. If the former, ghost load is best bet as noted above. If the latter, when a manufacture claims its LED is dimmable, it doesn't mean it dims suitably for performing arts. I test each type before approving, and won't consider if the spec doesn't say dimmable to 0.1% . 1% is not acceptable.

Short of replacing the drivers, not a simple task at all, I know no solutions.
 
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Andy Haefner

Member
Joined
Feb 23, 2018
Location
USA
@derekleffew today I tested them out at low percentages and it seems that they no longer emit visibly at around 4% (still have yet to test that percentage in a true blackout) but I think that method might work for keeping the LEDs powered slightly...
 

cbrandt

Well-Known Member
Joined
Dec 7, 2011
Location
Michigan
We've run into this all over the board when trying to help clients with LED transitions. In the architectural/electrical specifier world, 10-100% dimming is the norm, and they have a very hard time understanding why anyone would want something different. It is generally also the lowest cost solution that includes dimming. I can't tell you how many meetings I've been in just to discuss what the word dimming actually means in an entertainment space. As @BillConnerFASTC stated, even a 1-100% dimming has a dramatic and noticeable pop on from zero.

I'm glad to hear you got some good results with bringing them to near zero. I've had to break the news of "it just isn't possible with your system" too many times when I come in after installation is finished.
 
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robmerow

Active Member
Joined
Apr 20, 2010
Location
NYC
Sorry to hear that... as others have said this is becoming an increasingly common problem for performance venues and movie theaters.

A ghetto solution I've done before is to turn them on to full, and gauge how much less light than that you could live with. If it's 50%, then cover all the houselights with 50% Neutral Density gel. That way the "flick on" is only half as bright.

I've done this in an auditorium with dimmable fluorescent linear houselights. Perfect? Not by any means.