Sent: Friday, December 27, 2019 12:11:33 PM
To: Avid-L2@groups.io <Avid-L2@groups.io>
Subject: Re: [Avid-L2] Phillips Hue lights for a monitor backlight?
When you guys are done with that conversation, I have developed an advance technique, using molecular resonance and thermographic imaging, to split hair.
We could talk about that too.
;-);-);-)
On 2019-12-27 6:59 a.m., Pat Horridge wrote:
My understanding is that a neutral colour reflective backwall ensures all colours of light are reflected back evenly. (otherwise its actually a coloured wall)
If the light source shining onto that wall is missing some of the spectrum then so will the reflected light.
The result is greyscale on your monitor will look balanced (ie monochrome) when the colour temp of the display matches the colour temp of the reflected light. But saturated images on the display will look slightly off is the reflected light is lacking or over doing it in that part of the light spectrum.
That's why wide CRI lights are used when accurate colour reproduction is needed.
See this useful info from Phil Crawley http://philtechnicalblog.blogspot.com/
Pat Horridge
From: Avid-L2@groups.io <Avid-L2@groups.io> On Behalf Of bouke via Groups.Io
Sent: 27 December 2019 11:39
To: Avid-L2@groups.io
Subject: Re: [Avid-L2] Phillips Hue lights for a monitor backlight?
Or, why not use fluorescent tubes?
Those are dirt cheap, can have (if you spend a few buck more) a high CRI, produce close to no heat, and can be dimmed with pieces of gaffer tape if needed.
Can someone explain why a high CRI is important when the puropse is to the light a one-color wall? I would think the wall only reflects the color it was painted in.
So if that particular color is missing / lower in the light source, it simply would not come back. (And you have a free dimmer :-)
Bouke
Edit 'B / VideoToolShed.com
van Oldenbarneveltstraat 33
6512 AS Nijmegen
+31 6 21817248
On 27 Dec 2019, at 12:20, Pat Horridge <pat@horridge.org.uk> wrote:
Isn't it better and safer to just get 6500K bulbs? And you want a CRI that's as wide as possible.
Re dimming I'd be temped to use ND gel to dim if needed as its less likely to alter the colour temp.
Pat Horridge
From: Avid-L2@groups.io <Avid-L2@groups.io> On Behalf Of John Moore via Groups.Io
Sent: 26 December 2019 23:07
To: Avid L-2 Groups IO <avid-l2@groups.io>
Subject: [Avid-L2] Phillips Hue lights for a monitor backlight?
In my recent DolbyVision mastering class it was mentioned that the Phillips Hue Bulbs can be adjusted to proper color temperature for a monitor back light. It says in the various info I've obtained that the White Ambience Bulb is controlled by blue tooth and it can have a color temp of 27002K to 6500K. I picked up a couple lights and got them working. The interface on my new iPhone, yes I finally retired the BlackBerry Torch, and I can swing the color temp but the interface is not set up with a degree Kelvin parameter. It's either choose a preset or move the icon in a circle with the bottom going more blue white. I'm assuming the bottom of the circle would be approx 6500K.
Anybody played with these bulbs using a real color temp meter or know if there is a way to get a preset that is designed to set the bulbs to 6500K white.
They also have dimming and I'm wondering it the dimming would effect color temp. I know it did on tungsten lamps on the stage.
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
-- Marcel https://www.doctorswithoutborders.ca
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