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HMI’s in overhead soft box anyone (6 replies and 6 comments)

Jalaludin
1 month ago
Jalaludin 1 month ago

Dear forum members, I wonder if anyone of you have used 4k’s or M18’s in a overhead soft box supported by either a condor or a construction crane. 

There are a lot of things that don’t speak for it, but I just need the output shooting 500ASA at 72 or 120fps for some big wides.

I can’t use tungsten as I want to maintain the same color temp as the other HMI’s on the other lifts that play in the scene too. 

Probably can’t afford Dark Vader’s for them, so can’t really dim them. I guess the main question is how much the weight and closeness to diffusion a pain in the ass?

dmullenasc
1 month ago
dmullenasc 1 month ago

Sounds like you'll need a really good grip team to design something that heavy and large.  I'd rather see if I could do the same thing with a grid of Skypanels rather than HMI's pointed down, just because of the head feeder cables that HMI's need -- if you have a lot of them and find yourself with a bad cable that needs to be swapped out, it's a pain.  Not that Skypanels aren't finicky sometimes but if you have them close enough in a grid, then you won't need the diffusion frame underneath.  Or use the bigger Skypanel 360's for more softness.

Jalaludin
1 month ago

Thank you so much David, the 360's are out of our budged range unfortunately and I am just afraid 60's won't give us enough punch to give us a T5.6 over a wider area. But the cables might be an issue. I will figure it out and keep you posted. Thank you for your time to help out.

Roger Deakins
1 month ago
Roger Deakins 1 month ago

You could use Goya or X lights. They are open face with a wide beam and the are also safer to rig facing straight down. They would be cheaper than Skypanels though not color controllable.

Jalaludin
1 month ago

This is very helpful, appreciate it very much Roger.

Vanniyan
1 month ago

Master X light means xenon light?

Roger Deakins
1 month ago
Roger Deakins 1 month ago

No. They are Arri open face HMIs.

dmullenasc
1 month ago
dmullenasc 1 month ago

If you need 100 fc = f/2.8 at 100 ASA / 24 fps, then you'd also need that for 96 fps at 400 ASA let's say.

A Skypanel 60 at 27' away with lite diffusion is 10 fc, so 10 of them might get you 100 fc.

Jalaludin
1 month ago

Dear David, thank you for doing the math and all the support. It came up quick and I already shot one night with 48fps at 500 ASA. I couldn‘t find Goya or X lights that Roger mentioned earlier as I wouldn‘t find them that quickly. (Shot two days after my questions) So I went with something that was new to me as well but sounded as it could work.

It‘s a company called Skylight, they have a 10x10x10 cube that is lightweight and could be mounted easily on a condor. We put 6x 4K HMI globes in. They come without the mirrors or reflectors but give you in that configuration around 24k.

The surface personally is a bit small as in total we are lighting an area that has the size of 3 football fields, accompanied with 6 additional condors on the edges with each 2x18k‘s.

On the day with the 72fps will just try to get the Skybox as low over the scene as possible. Shooting 3 angles at the same time won‘t make it easier. Will see if it works out.

dmullenasc
1 month ago

Sounds like you could use more Skyboxes to cover that much area!

Mike
1 month ago

David,
What did they use before Skyboxes were available. It is a large area to light.

Jalaludin
1 month ago
Jalaludin 1 month ago

Skybox w/ Lightgrid

Jalaludin
1 month ago
Jalaludin 1 month ago

.

https://www.rogerdeakins.com/wp-content/uploads/2019/09/CEF5DEF1-0F9D-4098-92B4-F042BA86063D.jpeg
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