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differces between par HMI and copact HMI


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#1 iga wrotek

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Posted 28 May 2008 - 03:31 AM

Hi there
It's very basic question, which feels kind of stupid to ask.
but could anyone explain the qualities of par HMI lamps?
In general I lost track in what are differces between par HMI and copact HMI.
Which are good for what....
will be happy to get some advice
thanx
iga
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#2 Frank Barrera

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Posted 28 May 2008 - 05:44 PM

what do you mean by a "copact"?
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#3 timHealy

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Posted 28 May 2008 - 10:23 PM

if you are referring to "compact" HMI's, it just meant smaller HMI's fixtures. Especially fresnels. All HMI's once used the type of bulb that 18k and 12k fresnels still use today. They have one contact on each end with a spherical globe in the center where the arc ignites. Compact fixtures made use of bulbs with two contacts on one end which basically look like most tungsten bulbs that work in a mole richardson or arri lamps except there is no filiment.

Many HMI par lights also use the newer bulbs as well.


Best

Tim

Edited by timHealy, 28 May 2008 - 10:24 PM.

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#4 David Auner aac

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Posted 29 May 2008 - 01:46 AM

The advantage of HMI PARs is the ability to change lenses. Each lens offers a different throw from Super Flood to Spot. Check this out:
ArriSun 1200

Cheers, Dave
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#5 iga wrotek

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Posted 29 May 2008 - 01:23 PM

of course I ment 'compact' _ i read this term somewhere. I ment to ask about differences between regular HMI and par HMI.
thanx for advise. It's getting more clear now.

iga
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#6 timHealy

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Posted 29 May 2008 - 10:45 PM

If you mean fresnel when you write regular then fresnel lamps (including tungsten) have a clean even spread to them. That is their best feature.

Par lamps (including tungsten) best feature is that they kind of have more bang for the buck. They have a very powerful beam that does not have much spread. Now that beam can be used to give you an exposure (and often a very hot one) without that spread.

But they do come with lenses to vary the spread. The lenses offered are usually a narrow spot, medium, wide, super wide, (and some HMI pars have a fresnel like lens). HMI pars have the lens to change and tungsten pars usually needs to change the whole bulb to change a lens.

But whether one uses a par or fresnel depends on the use of the light.

Best

Tim
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