Jump to content


Photo

fluorescent lamp and flickering


  • Please log in to reply
6 replies to this topic

#1 Scottie Mei

Scottie Mei
  • Basic Members
  • PipPip
  • 35 posts
  • Cinematographer

Posted 12 March 2007 - 12:20 AM

Hi, I am shooting a low budget short. there is a scene set in a morgue that I would like to use flurescent lamps to get the green spike, but not sure which one should i get as there are cool white, warm white..etc..Also, I would like to get the flickering from flurescent lamps, but not sure if I should change the shutter angle to 90 or 45 degree. any feedback would be appreciated. thanks
  • 0

#2 James Brown

James Brown
  • Basic Members
  • PipPipPip
  • 235 posts
  • Cinematographer
  • Sydney, Australia

Posted 12 March 2007 - 01:50 AM

> fluorescent lamps to get the green spike,

If you want MORE green why not chuck some extra 1/2 + Green or WFG.

> I would like to get the flickering from flurescent lamps,

You can get the flickering by having one of your electrics crew hold the male end of the plug half into the socket and when it doesn't quite make contact it will flicker.

Regards James.
  • 0

#3 Thomas Burns

Thomas Burns
  • Basic Members
  • PipPip
  • 24 posts
  • Cinematographer
  • Los Angeles, CA

Posted 12 March 2007 - 11:21 AM

Scottie,

A flickering effect on commercial flourescent fixtures can be achieved by using a variac dimmer. Start with the unit at line voltage and slowly begin dimming down until you find the "sweet spot" where it begins to flicker. Good luck!

Best,

Thomas Burns
Electrician/Novice DP
Los Angeles
  • 0

#4 Juan Guajardo

Juan Guajardo
  • Basic Members
  • PipPip
  • 21 posts
  • Cinematographer

Posted 12 March 2007 - 01:46 PM

Warm White is about 3000k to 3500k and Cool Withe is 4100k to 4200k and meaby add some CC15G for a greenish look

for the shutter remember that over 1/60 you will have flickering so it must be on 144° or less.
  • 0

#5 Michael Nash

Michael Nash
  • Sustaining Members
  • 3330 posts
  • Cinematographer
  • Pasadena, CA

Posted 12 March 2007 - 06:04 PM

It depends on what you mean by "flicker" -- do mean flicker erratically, like a fixture with faulty ballast (visible to the eye)? Or pulse on film beacuse it's out-of synch with the frame rate?

I got a cool effect once by putting a Kino on a Magic Gadget, with very irregular flickering. It's touchy though, you have to find a "sweet spot" where the voltage is enough to get the ballast to kick, but not turn fully on or not strike at all. Not sure what that may be doing to the ballast, though... ;)
  • 0

#6 Scottie Mei

Scottie Mei
  • Basic Members
  • PipPip
  • 35 posts
  • Cinematographer

Posted 13 March 2007 - 12:53 AM

Hey Michael,

Thanks for sharing your gig with me. :) I would like to get a visible flickering as a fixture with faulty ballast . I will try the magic gadget and try loose the male end of the fixture. does your kino+magic gadget gig gives you the flickering effect I am looking for? or it just trun out to be flashy kinda flickering? thanks.

Thanks Thomas
  • 0

#7 Michael Nash

Michael Nash
  • Sustaining Members
  • 3330 posts
  • Cinematographer
  • Pasadena, CA

Posted 13 March 2007 - 09:10 PM

A "Magic Gadget" is a special effects flicker box that you can program. It can vary the voltage, flicker rate and pattern. It's used for creating firelight effects, TV effects, and so on.

http://www.magicgadgets.com/

I can't say for sure how your fluorsecent ballast would react. Some commercial ballasts might just crap out altogether, who knows. And of course using dimmers or flicker boxes means you have to have a fixture with an Edison plug on one end -- practical ceiling-mounted fluorescents are hardwired into the building.
  • 0


Visual Products

Wooden Camera

Broadcast Solutions Inc

Paralinx LLC

Opal

Rig Wheels Passport

CineTape

Metropolis Post

Ritter Battery

Willys Widgets

Media Blackout - Custom Cables and AKS

Gamma Ray Digital Inc

FJS International, LLC

Aerial Filmworks

Abel Cine

Tai Audio

CineLab

Technodolly

The Slider

Glidecam

rebotnix Technologies

CineLab

Willys Widgets

Opal

FJS International, LLC

Ritter Battery

rebotnix Technologies

Technodolly

Broadcast Solutions Inc

Tai Audio

Aerial Filmworks

CineTape

Metropolis Post

Visual Products

Gamma Ray Digital Inc

Wooden Camera

Paralinx LLC

Rig Wheels Passport

The Slider

Glidecam

Media Blackout - Custom Cables and AKS

Abel Cine