Jump to content


Photo

HMI Flicker/Pulsating @ 1000fps with flicker free ballast

HMI Flicker Pulse highspeed 1000fps flickfree ballast

  • Please log in to reply
8 replies to this topic

#1 Ash Barron

Ash Barron

    New

  • Basic Members
  • Pip
  • 3 posts
  • Cinematographer

Posted 02 February 2016 - 12:45 AM

I was shooting with the phantom 4k at 1000fps all day with HMIs (18k and 6k) on flickerfree ballasts.

 

All was fine until towards the end of the day when they started pulsing. I figured it might be a power surge or something?

 

Anyone experienced this before?


  • 0

#2 Robin R Probyn

Robin R Probyn
  • Basic Members
  • PipPipPipPip
  • 2332 posts
  • Cinematographer
  • Tokyo

Posted 02 February 2016 - 12:58 AM

were you shooting outside with ambient day light ?..  just wonder as maybe you had the flicker the whole time but noticed more as the ambient day light went down.. ? 


  • 0

#3 Ash Barron

Ash Barron

    New

  • Basic Members
  • Pip
  • 3 posts
  • Cinematographer

Posted 02 February 2016 - 12:59 AM

No, sir. All studio work and only used those 2 units until the point of pulsing..


  • 0

#4 Robin R Probyn

Robin R Probyn
  • Basic Members
  • PipPipPipPip
  • 2332 posts
  • Cinematographer
  • Tokyo

Posted 02 February 2016 - 03:09 AM

Ah.. ok sorry.. just a wild guess sir.. 


  • 0

#5 Ash Barron

Ash Barron

    New

  • Basic Members
  • Pip
  • 3 posts
  • Cinematographer

Posted 02 February 2016 - 03:12 AM

Thanks for trying!


  • 0

#6 John E Clark

John E Clark
  • Basic Members
  • PipPipPipPip
  • 850 posts
  • Other
  • San Diego

Posted 02 February 2016 - 12:58 PM

I was shooting with the phantom 4k at 1000fps all day with HMIs (18k and 6k) on flickerfree ballasts.

 

All was fine until towards the end of the day when they started pulsing. I figured it might be a power surge or something?

 

Anyone experienced this before?

 

From this site there is mention of 'arc wander' which affects HMI lights and may be produced independent of the power source. Don't know if this is your problem... but it could explain at least one pathway to 'flicker'... that is not based on power supply variations.

 

 

http://www.lovehighs...for-high-speed/


Edited by John E Clark, 02 February 2016 - 12:59 PM.

  • 0

#7 Jeo

Jeo
  • Basic Members
  • PipPip
  • 15 posts
  • Other
  • Bay Area

Posted 18 July 2016 - 11:18 AM

I had a very similar issue.

I shot with 2 18k and 3 6k. 

Everything was fine for about a day and a half then both 18k started to flicker. 

 

Fortunately I was planning to finish the day with the 6k anyway so all was fine but I'd like to find a way to reliably use 18k's in the future. 

The ballasts we had were running at 300 maybe if we had 1000hz ballast we'd be better off. 


  • 0

#8 Jean Gonzales

Jean Gonzales
  • Basic Members
  • PipPip
  • 37 posts
  • Electrician
  • Antwerp, Belgium

Posted 18 July 2016 - 03:12 PM

This problem could appear when loads are not equally divided over the phases.


  • 0

#9 Jon Kline

Jon Kline
  • Basic Members
  • PipPip
  • 45 posts
  • Cinematographer
  • Chicago, IL

Posted 18 July 2016 - 04:47 PM

Are the lamps relatively new?


  • 0



Also tagged with one or more of these keywords: HMI, Flicker, Pulse, highspeed, 1000fps, flickfree ballast

Willys Widgets

rebotnix Technologies

Technodolly

Broadcast Solutions Inc

Metropolis Post

The Slider

CineTape

Rig Wheels Passport

Tai Audio

Gamma Ray Digital Inc

Ritter Battery

Media Blackout - Custom Cables and AKS

New Pro Video - New and Used Equipment

Glidecam

Paralinx LLC

CineLab

FJS International, LLC

Aerial Filmworks

Wooden Camera

Visual Products

Abel Cine

CineTape

Tai Audio

Paralinx LLC

Glidecam

Wooden Camera

Metropolis Post

Technodolly

The Slider

Ritter Battery

Media Blackout - Custom Cables and AKS

Rig Wheels Passport

New Pro Video - New and Used Equipment

Broadcast Solutions Inc

Willys Widgets

CineLab

FJS International, LLC

rebotnix Technologies

Visual Products

Abel Cine

Aerial Filmworks

Gamma Ray Digital Inc