My LED Fixture Fades Instead of Snaps When Turned Off in a Zero Count

Symptoms/Issue

Your Desire and Source 4 LED fixture is set to a value 39% or less in a cue and should snap out in a zero count in the next cue, but it fades instead of snaps. 

Description/Explanation of Issue

This is a symptom of LED "smoothing". The fixture’s software has a function to smooth the incoming DMX data in order to maintain a smooth dimming curve.

• A large change sent from your DMX source, such as full to zero, is applied internally over a short period of time for a faster response.   
• A small change in DMX from your DMX source is applied internally over a longer period of time.  This is done to give DMX data a chance to refresh to provide smooth fades.  For example a 30 second fade from full to out.  Without this smoothing the fade would appear to pause throughout the fade.

Fix/Solution

Set the fixture curve to Quick, as smoothing doesn't apply to that curve

• This curve does have a steppier dimming performance, as it does not utilize this smoothing algorithm.