Jump to content

HMI Flicker/Pulsating @ 1000fps with flicker free ballast


Ash Barron
 Share

Recommended Posts

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?

Link to comment
Share on other sites

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.lovehighspeed.com/lighting-for-high-speed/

Edited by John E Clark
Link to comment
Share on other sites

  • 5 months later...

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.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

Forum Sponsors

Visual Products

VidGear.com - Broadcast Video Warehouse

FJS International

Film Gears

CineLab

Wooden Camera

Gamma Ray Digital Inc

Broadcast Solutions Inc

Serious Gear

Metropolis Post

Abel Cine

Tai Audio

New Pro Video - New and Used Equipment

Cinematography Books and Gear



×
×
  • Create New...