[SML] Dressing room LED bulbs (longish personal experience report)

[Bruce Bennett]

In speaking with an LED product manufacturer in March (Expo-Scene in Montreal) I learned that architectural lighting manufacturers only use CRI. 
TM30/the TLCI is not used. 

I would not be surprised if this applies to commercially available bulbs too. 

Tests with a camera and colour chart may be adequate to show differences in colour rendering between make up mirror bulbs and stage lights. Skin is a great comparator too.

Bruce 

"A society grows great when old people plant trees whose shade they know they shall never sit in." - Greek proverb

> On Sep 9, 2022, at 16:49, Ford Sellers via Stagecraft <stagecraft at theatrical.net> wrote:
> 
> TM30, definitely...  but comparing them to the lights in your rig may be fruitless... If they're color mixing units, and you're designer's pallet is not one of the manufacturer's pre-set CCTs, there is almost no way for you to get any sort of accurate comparison to the makeup mirror lights.
> 
> The best you can do is (maybe) to get the highest TM30 (fidelity) scores that you can on the makeup mirrors, and leave the costume/makeup to be tweaked to the stage lighting (or visa~versa) during Dress Rehearsals...  Either way... once the makeup is finalized, you need to have the best rendering at the place where it's applied each night. 
> 
> -----Original Message-----
> From: David Fox <David.Fox at etcconnect.com> 
> Sent: Friday, September 9, 2022 12:46 PM
> To: Ford Sellers <fsellers at chauvetlighting.com>; Stagecraft Mailing List <stagecraft at theatrical.net>
> Subject: RE: [SML] Dressing room LED bulbs (longish personal experience report)
> 
> [uncloaking]
> <SNIP>
> Color rendering would be my biggest consideration with makeup mirrors.  I know that the "High CRI" fluorescent lamps that the Facilities team tried to foist on Cornell U's Drama dept were NOT even remotely accurate at rendering color...
> <SNIP>
> 
> I get it. This might be tricky as IDEALLY, you want the CRI in the makeup mirrors to match the CRI of your theatrical fixtures. With incandescent vs tungsten, we could fake it pretty well but LED to LED?  Or Fluorescent to LED EEK. 
> 
> Also if you really want to make your head spin start looking at TM30 vs CRI which is WAY more accurately representing the spectrum in the color space but not yet implemented by enough people to expect to find a report for an A bulb. 
> 
> If it was me ( and ( know it is not) I would review datasheets for my theatre's inventory of LED fixtures and determine what the average CRI is. I know you and I both do this. Then I would try to match to dressing room lights, OR if that is more work than anyone cares to do, put 3000k lamps in the dressing room mirrors as a baseline and a few stagelights in the dressing room/make up room area by a mirror where they are the only source of illumination so that actors can check as they apply. 
> 
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