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par hmi difference


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#1 siddharth diwan

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Posted 04 June 2005 - 06:39 AM

What is the difference between a par hmi and other hmi's?
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#2 Adam Frisch FSF

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Posted 04 June 2005 - 08:40 AM

PAR stands for Parabolic A-something (aluminized?) Reflector. It' simply a mathematically designed parabolic shaped reflector designed to maximise the output from a source.

Generally, PAR lamps have much more punch, longer light throw and are harsher than regular fresnel HMI's. More bang for the buck, basically. A 6K PAR can many times outshine a 12K or a 18K Fresnel at long distances.

But they come with some drawbacks, too - all the lamps lenses have to be carried in a spearate box and mounted onto the lens and will never give you the same modeled light as a fresnel would. Another real pain is to change this lens when the lamp is hot - you need pliers to do it or your gloves will burn up.

I use PAR's when I need a lot of light, like on exteriors, but otherwise I prefer the light from fresnel HMI's - especially for interior work. But when using small HMI's that you need to tie in to a house outlet or to a small genny, then the PAR's like the 1200w PAR are more useful since they are so much brighter. A 1200 PAR can do some serious edgelighting fully spotted even on a sunny day.
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#3 David Mullen ASC

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Posted 04 June 2005 - 11:23 AM

Tungsten lights can come in PAR or Fresnel designs too (and open-faced).

A car headlamp is a type of PAR light, a self-contained globe, reflector, and lens unit.
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#4 Luke Prendergast

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Posted 04 June 2005 - 05:59 PM

I think it's Parabolic Arc Reflector.
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#5 Gilbert

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Posted 04 June 2005 - 08:25 PM

I think it's Parabolic Arc Reflector.

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Parabolic Aluminized Reflector (PAR)
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#6 Riku Naskali

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Posted 05 June 2005 - 07:57 PM

Another real pain is to change this lens when the lamp is hot - you need pliers to do it or your gloves will burn up.

An electrician I know had some bigass gloves just for that, no pliers needed but he was pretty quick...

I, on the other hand, was too slow and my jacket literally melted... :huh:
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Rig Wheels Passport

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Aerial Filmworks

CineLab

Broadcast Solutions Inc

New Pro Video - New and Used Equipment

Wooden Camera

FJS International, LLC

Media Blackout - Custom Cables and AKS

Metropolis Post

Abel Cine

CineTape

Technodolly

Willys Widgets

Ritter Battery

Visual Products

rebotnix Technologies

Glidecam

Tai Audio