[SML] Blue lighting

Thu Sep 1 14:15:34 UTC 2016

In reply to the points raised in the “unsent message”…

Yes, the human eye and brain are pretty forgiving.  They adjust to the ambient light, be it greenish, bluish, or reddish, and then other individual fixtures will look odd, in comparison… even if they would look normal if someone just came into the room from outside.

So, as others mentioned, you can color correct your scoops and pars to match the LED lighting (CTB 200s in LEE, 3200s in Rosco), but many cameras do not automatically color correct… so your pictures and videos may look blue.  So it may be better to use some warm lighting in the room décor, or to pinspot the tables (so a nice warm light is in the guests faces).

To “indemnify one’s self”, I’m not sure that’s really possible… a good start would be to make sure that as the LD, you are in control of all of the light.  Design the entire event, and you can balance the lighting.  If you are only lighting the stage, then be prepared to work with the ambient lighting in the room, and whatever the decorators bring. If there is someone in charge of Décor, talk to them before the event, to see what they are using, and suggest that they use some warm lighting, so that their “whites stay whiter” in comparison.

As to video… it’s been my experience that people expect it to be different from their environment, they are willing to accept if the color balance of the video is not the same as the color balance in the room.

-HTH,
-Ford
From: Stagecraft [mailto:stagecraft-bounces at theatrical.net] On Behalf Of tech dept via Stagecraft
Sent: Wednesday, August 31, 2016 5:13 PM
To: Stagecraft Mailing List
Cc: tech dept
Subject: Re: [SML] Blue lighting

Jerry, update.
I remembered that I started a reply to this issue last June and had saved it but I think now would be a good time to put it on the table.

******unsent message******

This is a lighting/human vision question that has been bothering me for a few years, now.

But recently I got a full dose of reality.

While doing lighting for a wedding, the bride got into my face about the orange colored lighting of her stage. She had only been in the space for a few minutes. To others, just walking from a bright sunshiny day the same lights were white (3000k +-).

The stage was lit with EGG lamped scoops and 1000 watt PAR 64's, 115 volts applied.

But the rest of the 3500 sqft room was ringed with 5000klm 'curtain string' led lights, behind pure white shear curtains.

So, question here, being that the eye has a color persistence, mine can seem to be as long as 10 minutes, With low CRI lighting what options do I have (like Lee filters) to white-balance my rooms/stages.

Xxxxxxx, what would you do to indemnify ones self in situations like this where the designer has little control of someone else's expectation(s) but their perception of reality is being controlled not by their own actions.

New question. What would be the best practices to condition the public's eyes prior to showing a video.

Should I even worry about it?

Have there been any studies revealing problems regarding vision, reading, and low CRI white lighting.

Me thinking out loud...

In additive color mixing (RGB) IF say I just have red and green leds up full then I get Gold and if I just have green and blue then I just get some form of aqua. IS the eye(or brain) performing some sort of automatic selective gain control (color to color) and has the release time set to very long? What I am saying is that there IS so much invisible, (VERY narrow bandwidth) blue that the eye is turning down the sensitivity to blue and what we know is white has a neural filter being applied, such that only the red and green components are visible (sic. Of that white source)? Brightness is not only being controlled by the iris?

More thinking... What's to say that to get white with the blue die that that blue die is of such a narrow bandwidth that there has to be a whole bunch more of it for our eyes to balance to the other colors in the led emitter.

Jerry, Richard comments?

31.08.2016, 23:43, "Jerry Durand via Stagecraft" <stagecraft at theatrical.net<mailto:stagecraft at theatrical.net>>:
We just went to meet a client at a local new-ish hotel and the elevator lighting is blue LEDs close to UV, sort of near-near-UV.  Anyway, dark interior other than the advertising inside the door make it hard to see.  Seems lighting like that wouldn't be code, it bothered my eyes a bit, I could imagine some people would have more trouble seeing.

--

Jerry Durand, Durand Interstellar, Inc.

www.interstellar.com<http://www.interstellar.com/>

tel: +1 408 356-3886

,

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