Hard Daylight Lights
- Thread starter dwcwiak
- Start date
Cool Lights
DVXuser Sponsor
Yes there are. Its known as ceramic metalhalide discharge or CDM.
http://www.coollights.biz/clmf0070-cool-lights-fresnel-p-120.html
http://www.coollights.biz/clmf0150-cool-lights-fresnel-p-63.html
HMI is metal halide also, its a big family with lots of different types.
http://www.coollights.biz/clmf0070-cool-lights-fresnel-p-120.html
http://www.coollights.biz/clmf0150-cool-lights-fresnel-p-63.html
HMI is metal halide also, its a big family with lots of different types.
Barry_Green
Moderator
You can also go with FAY lights.
http://www.mole.com/rentals/catalog_sheets/5711.pdf
http://www.bulbman.com/index.php?main_page=product_bulb_info&products_id=10064
Sometimes called the poor man's HMI. But with only 30 hours of life on a lamp, I don't know how well a poor man could afford to use FAY lights. But, if it's for a short project, $58 for a lamp that spits out daylight-colored light... not that bad. But it also requires 3x to 4x as much power to deliver equivalent brightness, as compared to an HMI.
http://www.mole.com/rentals/catalog_sheets/5711.pdf
http://www.bulbman.com/index.php?main_page=product_bulb_info&products_id=10064
Sometimes called the poor man's HMI. But with only 30 hours of life on a lamp, I don't know how well a poor man could afford to use FAY lights. But, if it's for a short project, $58 for a lamp that spits out daylight-colored light... not that bad. But it also requires 3x to 4x as much power to deliver equivalent brightness, as compared to an HMI.
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Chris Santucci
Veteran
Also consider (if you haven't) only correcting tungsten 1/2. Then you can white balance somewhere in between your 1/2 corrected tungsten lighting and the daylight and it's not all that noticeable.
Doing a full correction will cut your light output in half.
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Doing a full correction will cut your light output in half.
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Um, no. According to the Rosco Swatchbook the transmission of Full CTB is 36% which means that you would lose well over a stop. Holding a piece of Full CTB over my incident meter reading 100FC, cuts it down to 33 FC or by a stop and two thirds. An additional two thirds of a stop over what Chris erroneously claims is a significant additional loss.
The transmission of the Half CTB that Chris suggests is 52% which means that you would lose a full stop to the Half CTB gel. HMI sources are also more efficient than Tungsten source in that they generate more lumens per watt. In other words you will require a tungsten head that is more than six times as large to get the same output as an HMI head.
For instance, compare a 2k Fresnel with full CTB gel to a 1200 W HMI Fresnel. According to Arri's photometric calculator, the 1200W Fresnel will put out 6 times as much light (two and a half stops) and use 30 percent less power (w/ a PFC ballast) than the 2k Fresnel with full CTB on it.
In terms of output, gelling tungsten lights even partially is not much of a solution. There is simply no cheap substitute for a HMI Fresnel when you want a daylight balanced hard source.
Guy Holt, Gaffer, ScreenLight & Grip
Chris Santucci
Veteran
I just checked and I lose 2 full stops with full CTB over my meter. Damn! That explains a lot :shocked:
And again, no matter what the loss, you CAN always correct only 1/2 to daylight and enjoy only half the loss of output (as with full CTB) without an annoying variance in color temperature.
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And again, no matter what the loss, you CAN always correct only 1/2 to daylight and enjoy only half the loss of output (as with full CTB) without an annoying variance in color temperature.
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+1. I used to have a single, four and two nine-lights all globed in daylight FAY par 36 globes, which have the dichroic filter built-in. These Mole fixtures can be found in ready supply online and in rental houses.