I am wondering what the best and most eco-friendly LED-light is to light a chroma-key studio with a height of 22 feet , a length of 44 feet and a depth of 38 feet.
We prefer lights that are cost-effective and won't give us a heart attack once we get the electricity bill yet we do not want to compromise.
If these are just for wall washing green screen, there is no need to buy bi-color instruments.
Bi-color heads are going to be more expensive (and not as bright) as equivalent single-color instruments, so that's where I'd put my money. Especially since you are going to need lots of them for a stage that big (especially one that tall).
I also wouldn't buy kits like that to rig a studio either, you'd be much better off just purchasing the heads you need for a permanent stage install. With those kits you're also buying stands, cases, and batteries... things that are not needed at all for instruments needed for the lighting grid.
I won't recommend specific instruments, though... that's what you've got a gaffer for, who knows the space and your needs, budget, uses, and all that jazz.
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