Today I got a Luxi Light meter and to test it I decided to measure some light bulbs against a Mole-Richardson kit I have out for a documentary I’m working on (http://bpmdocumentary.com/)
So here’s the results that I got at 6ft, 800 ISO, 1/48th
Tweenie @ Full Spot f/22.6
Tweenie @ Full Flood f/12.1
Betweenie @ Full Spot f/20.2
Betweenie @ Full Flood f/11.3
Mole 800w Soft with Eggcrate f/4.8
Mole 800w Soft without Eggcrate f/5.7
Light Bulbs in Scoop
100w LED with umbrella f/3.4
100w LED without f/4.5
300w Photoflood with umbrella f/4
300w Photoflood without f/5.7
500w Photoflood with umbrella f/8
500w Photoflood without f/11.3
While you may think that something like a 300w photoflood is enough because you could close down to f/5.6, if you want diffusion, there goes a stop. If you want a gel like CTB, that might cost you another stop of light and when you go to a wide, you’ll probably need the lights furtherer than 6ft way. And all of a sudden your left with only f/2 of light. However using something like a Betweenie offers you lots of options with barndoors, spotting and flooding. If only I had the money….Film Life.
Oh and the Luxi Meter is pretty sweet.
Zachary Will is an Award-Winning Filmmaker creating short films and content for the Internet as the owner of Riverside Studios. He has a Bachelor's in Film from Full Sail University. He has worked on productions for companies like Webmd, Sears, Home Depot, Six Flags and more!
"the trick is to never give up... I think the secret of success is not how little you get knocked down but how often you get back up." - Gareth Edwards