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» Film-Tech Forum   » Operations   » Digital Cinema Forum   » A question on dimmers.

   
Author Topic: A question on dimmers.
Andrew Thomas
Master Film Handler

Posts: 269
From: Pearland, TX, USA
Registered: Jun 2012


 - posted 01-01-2014 10:41 PM      Profile for Andrew Thomas   Email Andrew Thomas   Send New Private Message       Edit/Delete Post 
So we have our theater up and running and mostly things are going well. We have Jnior automation set up on our 4 Christie series 2 projectors, but the old place has never had dimmers. I'm trying to find what would be the best solution for dimming 6-12 lights in our auditoriums? I suppose we will be using dim-able LEDs...or should we go a different direction?

If there is more information you need before making a recommendation, let me know. Thanks guys!

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Frank Cox
Phenomenal Film Handler

Posts: 1943
From: Melville Saskatchewan Canada
Registered: Apr 2011


 - posted 01-01-2014 11:14 PM      Profile for Frank Cox   Author's Homepage   Email Frank Cox   Send New Private Message       Edit/Delete Post 
I have a Kelmar dimmer, and just use standard-issue floodlight bulbs in the fixtures in the auditorium. I suppose that I will someday change them out for something led or whatever, but what's there now is working fine for the time being.

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Dave Macaulay
Film God

Posts: 2080
From: Toronto, Canada
Registered: Apr 2001


 - posted 01-02-2014 04:28 PM      Profile for Dave Macaulay   Email Dave Macaulay   Send New Private Message       Edit/Delete Post 
I recommend the Kelmar dimmers, not cheap but maybe cheaper than finding and figuring out an alternative. They will work with your existing lamps, and Kelmar dimmers should work with most LED replacement bulbs. They also offer an LED output module that is supposed to handle those lamps that don't play nice with the basic dimmer.
There are other dimmers available but the Kelmar ones are made for cinema use and automating them from a Jnior is simple. Finding a dimmer with relay closure control isn't easy, and the network control dimmer I am trying to set up is not user friendly at all.

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Gordon McLeod
Film God

Posts: 9442
From: Toronto Ontario Canada
Registered: Jun 99


 - posted 01-02-2014 06:15 PM      Profile for Gordon McLeod   Email Gordon McLeod   Send New Private Message       Edit/Delete Post 
I have been told that the CREE brand of dimmable LED lamps from home depot work on any solid state dimmer and have about 98% dimming range
I have yet to play with them
The issue most dimmers have is two fold one the dimmer may not have the minimum load that the thyristor(s) require to aquately and stabily fire
two the ballast in the socket of the LED module is often a switch mode device that can not work well with the chopped wave form most dimmers produce

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Andrew Thomas
Master Film Handler

Posts: 269
From: Pearland, TX, USA
Registered: Jun 2012


 - posted 01-07-2014 03:43 PM      Profile for Andrew Thomas   Email Andrew Thomas   Send New Private Message       Edit/Delete Post 
Thank you gentlemen. Any recommendations for vendors?

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Gordon McLeod
Film God

Posts: 9442
From: Toronto Ontario Canada
Registered: Jun 99


 - posted 01-07-2014 04:24 PM      Profile for Gordon McLeod   Email Gordon McLeod   Send New Private Message       Edit/Delete Post 
The Ash Stevenson are a good reliable dimmer

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Dave Macaulay
Film God

Posts: 2080
From: Toronto, Canada
Registered: Apr 2001


 - posted 01-11-2014 01:23 PM      Profile for Dave Macaulay   Email Dave Macaulay   Send New Private Message       Edit/Delete Post 
The Ash Stevenson is a fine basic dimmer, but try to get any response from the company. I suppose they're still in business - but it doesn't appear that they want to be much longer.
The Kelmar dimmers are good, and work fine with many LED lamps. Plus, Kelmar even answers their phone and replies to emails!!!
Kelmar's major problem for me is that the dimmers are not (and won't be, according to Kelmar) CSA ur ULC approved and thus require special inspection to use legally here in Canada. This adds up to $100.00 to the price of a dimmer.

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Andrew Thomas
Master Film Handler

Posts: 269
From: Pearland, TX, USA
Registered: Jun 2012


 - posted 01-11-2014 04:08 PM      Profile for Andrew Thomas   Email Andrew Thomas   Send New Private Message       Edit/Delete Post 
Yeah, I was really impressed by how quickly Kelmar got back to me. Brad's a dealer, so I'll be shooting him an e-mail in the next couple of days about ordering them.

Thank you for the help, everybody!

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Louis Bornwasser
Film God

Posts: 4426
From: prospect ky usa
Registered: Mar 2005


 - posted 01-12-2014 04:32 PM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
I have about 30 Kelmar 2400 watt simple up/down dimmers, used. Utility model. email me. louis

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