Daylight filters & Quartzcolor tungsten LED fresnels

[Infilmer]

Hi,

For our upcoming shoot we will probably be using Quartzcolor LED fresnel fixtures with true tungsten color temperature.
My question is, will daylight filters also produce a true daylight color temperature with LED tungsten color temperature? And what filter would you use?

Does it matter at all?


Thanks in advance,
-Charley

 

[David W. Jones]

I think your biggest concern will be with the 1 2/3 stops of light output loss you will incur using a full CTB gel, which only has a 36% transmission rate.

Just something to think about.

 

[j1clark@ucsd.edu]

Hi,

For our upcoming shoot we will probably be using Quartzcolor LED fresnel fixtures with true tungsten color temperature.
My question is, will daylight filters also produce a true daylight color temperature with LED tungsten color temperature? And what filter would you use?

Does it matter at all?


Thanks in advance,
-Charley

Why would you want to filter the lights? Are you mixing 'daylight' and these lamps.

 

[Infilmer]

Yes, we will be mixing daylight with artificial light. Many scenes will be shot in a room with lots of windows.
As far as I've found out so far, the way to go is go use (LED) tungsten lights with half or 3/4 daylight filters.

I have also found filters that have have 40% and 50% transmission rates, which will retain enough light for our situation because we will use 1000w equivalent fixtures.

Any more thoughts on this?

 

[j1clark@ucsd.edu]

Yes, we will be mixing daylight with artificial light. Many scenes will be shot in a room with lots of windows.
As far as I've found out so far, the way to go is go use (LED) tungsten lights with half or 3/4 daylight filters.

I have also found filters that have have 40% and 50% transmission rates, which will retain enough light for our situation because we will use 1000w equivalent fixtures.

Any more thoughts on this?

I was not able to find any 'spectral' data on Quartzcolor LEDs. So, it would be unknown as to how 'spiky' or 'smooth' the spectrum is. I would strongly suggest setting up the lights, filters, and measuring as well as some capturing some clips before hand.

 

[Michael Carter]

Y'know, there are 4-bank Biax flos on amazon for $90 now. You can get several dual and quad biax units for less than you'd rent Kinos for a small shoot. They're almost at a "disposable" price these days. I'd grab a few for daylight use, putting full CTB on anything is a huge waste of power.

 

[Moseph]

Yes, we will be mixing daylight with artificial light. Many scenes will be shot in a room with lots of windows.
As far as I've found out so far, the way to go is go use (LED) tungsten lights with half or 3/4 daylight filters.

I have to wonder why you'd go this route. Is that the gear that's available? Because it sure is less than ideal. Most day interiors are shot with daylight balanced sources. The last time I can remember being on a job with tungsten corrected CTB for a day interior was several months ago and it was two maxi brutes, so the stop loss wasn't a major concern.

I think there's a good chance you'll also find yourself disappointed with the color that you get from putting CTB in front of an LED. It might work out fine, but I can almost guarantee you it won't look exactly like a real tungsten light with CTB.