Hey, I’ll be shooting talent full body on the PIXBOOM in studio later July and am wondering how large of lights will be needed to comfortably shoot between 750-1000 fps at a 4-5.6. I have only shot slow mo exterior with the sun so my reference point for how much light is needed is skewed.
would it be recommended to have at least an m90 to key through a 12x frame with 1/2 diffusion? Or multiple 2400 nanlux through the frame? Would a maxibrute also work or will that flicker?
thanks for your help!
I have a shoot tomorrow in studio and can share a few tips after then however just by doing the math now its pretty easy to calculate how many Foot Candles you need.
This was based on a UHD 4K 937 FPS capture using 180 shutter.. So around 1/1874 / sec exposure time, exposing for T4 at 400 Iso
You will need 1903FC … … Now you just need to understand where the light will be and measure the distance between the fixture and subject + add any losses from diffusion.
Minimum spec you could use a 1200x putting out 1840fc from 3M or 9.8ft away ( this would be with a 45 degree reflector ( Hard Light ) per apurtures spec sheet.
To achieve lighting a 12x with 1/2 grid would need alot of light… Like I showed above, you just need the distance of light placement to give an accurate number… Inverse Square Law … Each time you double the distance you retain only 25% of the light output.
When shooting through or boucing something I like too make two calculations… One from the fixture to the output of the shoot thru or bounce… and then from the NEW soft light source to your subject. Because each time you modify the light it because a new light source.
Thank you for this and the light calculator! I’ll put in some research with this.
Good luck on your shoot tomorrow, would love to hear how it goes!
If you need help with the calculations, send over your lighting diagram with measurements and it should be easy from there.
Let me know what you end up using,
I’m supposed to film a 1x1 object at 1-2k fps next month (assuming they will actually ship my camera eventually).
And also not sure what kind of lights to take on that shoot - alternatively I was thinking to shoot outside with diffusion fabric above my subject.
Just finished my studio shoot yesterday and they didn’t follow my request on the lights so my idea of shooting at T4 400 iso went out the window real quick.
We had a large object as our subject that was about 6’ wide and 4’ tall … Mainly shaping lighting for 9x16 content. They placed a 1200 @ 100% above with a 150 dome with grid.
two other 500’s were rim and side lighting it, and keep in mind we were in a pretty narrow white studio so a fair amount of bounce.
I had to be at T2 1600 iso for 937FPS 4K… This gave me a pretty great exposure in bare metal and light colored items as well. Not too noisy in the shadows.
The last shot of the day was much closer up, I would say a 2ft x 3ft frame area and now the 1200 was much closer up on the subject. We only used the 1200 at 100% no other light, and I was at about a T4.5 1600 iso on camera.
I think my basic setup for anything bigger then table top would be 2 x 1200’s and 2 500’s … if its table top stuff … 1 - 1200 and 2 - 500’s ish
Once you blow past 1000 fps you’re really starting to need 2400 lights or Daylight 
Very helpful, thank you! Totally dismantles my idea of using more portable lights 
Maybe only for Macro shots or no diffusion.
