LED continuous lighting
Dec 13, 2012 11:54:32 #
The one I have, has three different filter plates that mount over the light unit to create the different light temperatures.
Dec 14, 2012 16:59:11 #
Brian in Whitby
Loc: Whitby, Ontario, Canada
michaelgem wrote:
Since a single LED is fixed in color temperature, the only way to have adjustable color temp would be to blend 3200K leds with 5600K leds, neat trick if that is what is done.
They do not list the lumins output which might be an important limitation depending on how big a scene you are trying to illuminate.
The three reviews were very positive. Let's hear back from anyone who buys this unit.
They do not list the lumins output which might be an important limitation depending on how big a scene you are trying to illuminate.
The three reviews were very positive. Let's hear back from anyone who buys this unit.
There are tunable LEDs that can be made to change colours according to the bias voltage. I don't know if they are in common use yet but that could be one application of them. It does not really seem relevant to me since it is possible to change colour balance easily in post processing.
Dec 14, 2012 17:22:15 #
They also vary the output power for the different LED's, so they can mix intensity and tempurature to get a varied color temp and brightness.
Dec 15, 2012 21:39:41 #
Brian in Whitby wrote:
quote=michaelgem Since a single LED is fixed in c... (show quote)
They are not is common use, and I would appreciate a reference showing they exist, as I am skeptical.
Dec 15, 2012 22:14:53 #
Brian in Whitby
Loc: Whitby, Ontario, Canada
It may take a while but I will see what I can do. It was several years ago I read about them and I do not remember the source.
Dec 15, 2012 22:51:13 #
Brian in Whitby
Loc: Whitby, Ontario, Canada
[URL]http://cerncourier.com/cws/article/cern/46530[\URL]
[URL]http://onlinelibrary.wiley.com/doi/10.1002/adma.201100806/abstract[\URL]
This is not what I was talking about but such a system might meet the needs of the photographer.
[URL]http://ledsmagazine.com/news/9/10/25[\URL]
Here is a photographic product that uses two different colours of LEDs to produce a variable temperature light source.
[URL]http://www.alphatron.tv/2012091755/general-news/ledpro-z6-tunable-bi-color-on-camera-led-light-from-ledpro.html[\URL]
[URL]http://onlinelibrary.wiley.com/doi/10.1002/adma.201100806/abstract[\URL]
This is not what I was talking about but such a system might meet the needs of the photographer.
[URL]http://ledsmagazine.com/news/9/10/25[\URL]
Here is a photographic product that uses two different colours of LEDs to produce a variable temperature light source.
[URL]http://www.alphatron.tv/2012091755/general-news/ledpro-z6-tunable-bi-color-on-camera-led-light-from-ledpro.html[\URL]
Dec 15, 2012 23:18:47 #
[quote=Brian in Whitby][URL]http://cerncourier.com/cws/article/cern/46530[\URL]
[URL]http://onlinelibrary.wiley.com/doi/10.1002/adma.201100806/abstract[\URL]
This is not what I was talking about but such a system might meet the needs of the photographer.
[URL]http://ledsmagazine.com/news/9/10/25[\URL]
Here is a photographic product that uses two different colours of LEDs to produce a variable temperature light source.
[URL]http://www.alphatron.tv/2012091755/general-news/ledpro-z6-tunable-bi-color-on-camera-led-light-from-ledpro.html[\URL][/quote]
Thanks for this great information.
From your URL leads we can conclude:
1. Research has resulted in a tunable led. It has yet to reach the market as a viable product, and for whatever reason it appears to still be a laboratory research project stage.
2. Multi-hue led lights consisting of arrays of red, green, and blue fixed color leds are in mass production. I own several and they come with a remote to control the intensity and combined hue output.
3. The tunable-bi-color-on-camera-led-light-from-ledpro that you found is another version of the led array which began this discussion. It varies its intensity by varying the applied voltage, and its color temperature between 3200K and 5600K by varying the combinations of 3200K leds and 5600K leds that are turned on.
[URL]http://onlinelibrary.wiley.com/doi/10.1002/adma.201100806/abstract[\URL]
This is not what I was talking about but such a system might meet the needs of the photographer.
[URL]http://ledsmagazine.com/news/9/10/25[\URL]
Here is a photographic product that uses two different colours of LEDs to produce a variable temperature light source.
[URL]http://www.alphatron.tv/2012091755/general-news/ledpro-z6-tunable-bi-color-on-camera-led-light-from-ledpro.html[\URL][/quote]
Thanks for this great information.
From your URL leads we can conclude:
1. Research has resulted in a tunable led. It has yet to reach the market as a viable product, and for whatever reason it appears to still be a laboratory research project stage.
2. Multi-hue led lights consisting of arrays of red, green, and blue fixed color leds are in mass production. I own several and they come with a remote to control the intensity and combined hue output.
3. The tunable-bi-color-on-camera-led-light-from-ledpro that you found is another version of the led array which began this discussion. It varies its intensity by varying the applied voltage, and its color temperature between 3200K and 5600K by varying the combinations of 3200K leds and 5600K leds that are turned on.
Dec 16, 2012 01:46:21 #
Brian in Whitby
Loc: Whitby, Ontario, Canada
Yup! That's about it. I am surprised there has not yet been progress on a production version of the Tunable LED. I guess R&D takes time as well as money.
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