4th April 2007
Has anybody put a china ball with up to 500 w bulb on a battery before at the end of a boom arm or something similar for mobile situations? If so can they shed light on how they did it.
Matthew Woolf wrote :
>>Has anybody put a china ball with up to 500 w bulb on a battery >>before at the end of a boom arm or something similar for mobile >>situations?
Talk to James at www.Jemlighting.com he is the Jem ball man and has done most everything.
What batteries are you pulling 500 w out of for any time, and still maintaining mobility?
I did this for some steadicam shots with battery powered kinos on the end of a boom but they don't draw the wattage you are talking about.
Oh Seven Films
143 Grand St
Jersey City, NJ 07302
201 200 0273
917 406 6157
For About a Girl I used a K5600 400W Joker in a China Ball running off a Lightning Strikes battery on a trolley, assistants just dragged the trolley along.
It's in use on 90%+ of the shots.
Geoff Boyle FBKS
Director of Photography
A 400 watt Joker/Bug on a Jem Ball with the Liberty Lithium Battery Belts will burn for about two hours!
>> Re: china ball on a battery
For the film 'Monster' we put a china-ball on the end of a poll on the dolly during the skating rink scene. We used a 4D size battery (very large boat or truck battery) and an inverter with a paper lantern and a 500w globe (probably an ECT). If you need to hand-hold the paper lantern, such as in a 'walk and talk' situation, and can't have any cable to the light, I find it best to use a Jem-Ball with a 200watt or 400watt Joker-Bug, slimverter, and battery belt, all slid into a backpack. The Joker-Bug usually has a CTO glass if you need to be tungsten balanced, and bobinette is usually good if it's too bright. Hope that helps.
A note about the battery: Any large auto-type battery will work, but the best is some sort of sealed gel-cell, as auto or marine batteries can be dangerous - flammable hydrogen fumes and spillable battery acid among them.
Los Angeles, CA or anywhere else I'm invited
>>What batteries are you pulling 500 w out of for any time, and still >>maintaining mobility?
I've run up to 1.2k HMI on batteries and inverters on trolleys.