Amount of light?
Posted 30 April 2011 - 06:03 AM
I'm looking for a relatively simple way of calculating the amount of light I would need to illuminate any given area. Ofcourse, thus depends on many factors; size of the area, how far away the lights need to be etc. Given that you know these two factors, how would you calculate the wattage and number of lights?
I've looked around but haven't been able to find a simple way of going about it,
I would appreciate any help you could provide.
Posted 30 April 2011 - 07:09 AM
Posted 30 April 2011 - 08:32 AM
But, if you're looking for what light to use to get 40FC there is no correct answer, it depends upon style...
So in essence, you are the one who says how much light you need for any given area. And it'll take experience and time to know which lights you'd use for which situation. You'll have to know how much light is required for what stop you're at on which system you're using first, then you'll have to know which lights can producer that much light at that distance (normally available upon a manufacturer's website,) and then youll also need to factore in if you can fit the light into your given area (for example, I highly doubt you could fit an 18K into a small bathroom).
Posted 30 April 2011 - 10:06 AM
Posted 30 April 2011 - 05:15 PM
Dig down through to the data sheets for individual fixture models like the 50 degree Source Four.
Posted 30 April 2011 - 05:43 PM
Maybe one open lamp, no reflectors or diffusion or otherwise on a blacksand beach or theatre stage and you'd be pretty sweet with the inverse square law
I think most DoP's go with experience - so you just gotta get in there, take notes.
Its interesting in that reading up on the complexities of realistic 3D rendering can shed light (guffaw) on the real world situation:
Posted 02 May 2011 - 02:17 AM
I have a project in the near future where I'll need to light a 450x450 feet area. I don't yet have the experience to know what I need to bring to have it covered. Therefor, a simple way of calculating amount of I need for a given helps immensely.
Posted 02 May 2011 - 07:49 AM
for that large of an area, you're in the big HMI range.
an 18KW HI 450ft i on the middle of it's "spot flood" should give you a T1.8 on 500 speed film (8 fc) in the middle of the beam and the overall cone of the light would be 240 ft, or so. So 2 18KW HMIs overlapped would light up your space but it wouldn't necessarily be very interesting, and this of course would have to be night.
Posted 05 May 2011 - 11:12 PM