[SML] Interpreting LED color fixture photometrics

[Ford Sellers]

Hi Joe,
I'm not sure how I missed this one....
For fixtures that we design for Key Light, we include photometrics of the fixtures at various CCTs.
this gives you brightness, and TM-30 Fidelity and Gamut scores.

Here's an example of one of our reports:
https://chauvetprofessional.com/wp-content/uploads/2023/09/Ovation-Reve-F-3-Photometrics-Report-1.pdf
You'll see photometrics for "Full Power", as well as 3200k, 4000k, and 5600k at Full Spot, Full Flood, and 50% Spot, in addition to individual colors at 50% flood.

You'll find reports like this for almost all new fixtures (from us, anyway).

Just go to a fixture page, click on "download Product Information," or scroll aaaaaallllll the way to the bottom of the page,  and then select the Photometrics Report
________________________________
From: Stagecraft <stagecraft-bounces at theatrical.net> on behalf of Joe via Stagecraft <stagecraft at theatrical.net>
Sent: Monday, June 1, 2026 7:01 AM
To: stagecraft at theatrical.net <stagecraft at theatrical.net>
Cc: Joe <jdunfee12 at yahoo.com>
Subject: [SML] Interpreting LED color fixture photometrics

I am unsure how to interpret the photometrics for LED fixtures that have many colors. E.g. RGBAL+UV. I am guessing that if the photometrics are provided, that they give Lumens or Lux at full brightness for each color. Which of course, leaves you guess about the brightness if you adjust for a warm white. Then, many fixtures also reduce the wattage for the various colors if you bring each color up to 100%, because that would prevent overheating.

Another issue is for lower-end fixtures designed primarily for the DJ market. They may only provide the wattage for the LED chip. And it would be normal for that to be exaggerated.

Any ideas about how this is handled?.. especially the more professional theatrical light?

-Joe Dunfee
717-203-8670 Cell

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