Jump to content


Photo

High speed shooting hospital - led and overhead flourescents?


  • Please log in to reply
4 replies to this topic

#1 Ed David

Ed David
  • Sustaining Members
  • 39 posts
  • Cinematographer
  • NYC

Posted 22 August 2016 - 09:12 AM

Hi guys - apologize if this has been asked before

 

doing a high speed 240 FPS shooting in an existing hospital - 

question - can I switch out the overhead tubes for kino bulbs and not have flicker?

 

and can I use LED lighting like litemats?

 

what can i get away with besides flicker-free HMIs bouncing into ceilings, etc etc?

 

thanks!
Ed


  • 0

#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19962 posts
  • Cinematographer
  • Los Angeles

Posted 22 August 2016 - 09:36 AM

Changing out the tubes won't help because it's the ballasts that determine the flicker rate. 

 

Your flicker-free ballasted lights should be fine but it wouldn't hurt to test.


  • 0

#3 Ed David

Ed David
  • Sustaining Members
  • 39 posts
  • Cinematographer
  • NYC

Posted 22 August 2016 - 09:30 PM

Thanks David!!!


  • 0

#4 Nima Khazaei

Nima Khazaei
  • Sustaining Members
  • 23 posts
  • Student
  • San Francisco

Posted 23 August 2016 - 04:08 PM

Your Litemats should be flicker-free too.

 

http://www.litegear....e-flicker-free/

 

I've yet to have any flicker issues with any of my LED lights. I suspect most cinema LEDs use either constant-current regulation for dimming, or frequencies high enough to keep them safe for all but the most extreme of frame rates.

 

My inclination would be to make good use of HMIs, just given the 3-4 extra stops needed for 240 fps.


  • 0

#5 Phil Rhodes

Phil Rhodes
  • Sustaining Members
  • 12058 posts
  • Other

Posted 23 August 2016 - 06:12 PM

I'd be a little (a lot) cautious of HMIs. I've seen tests in which they caused serious problems on high frame rate stuff, even with expensive ballasts switched to flicker-free mode.


  • 0


rebotnix Technologies

Media Blackout - Custom Cables and AKS

FJS International, LLC

Aerial Filmworks

Metropolis Post

The Slider

Willys Widgets

Paralinx LLC

Rig Wheels Passport

Tai Audio

Ritter Battery

CineTape

CineLab

Glidecam

Broadcast Solutions Inc

Abel Cine

Visual Products

Technodolly

Gamma Ray Digital Inc

Wooden Camera

CineTape

Paralinx LLC

Wooden Camera

Ritter Battery

Aerial Filmworks

Broadcast Solutions Inc

Willys Widgets

Glidecam

Gamma Ray Digital Inc

Tai Audio

Media Blackout - Custom Cables and AKS

rebotnix Technologies

Rig Wheels Passport

Visual Products

The Slider

Technodolly

Metropolis Post

FJS International, LLC

Abel Cine

CineLab