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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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Metropolis Post

Glidecam

Media Blackout - Custom Cables and AKS

Gamma Ray Digital Inc

Tai Audio

Ritter Battery

rebotnix Technologies

Paralinx LLC

CineLab

Opal

Wooden Camera

CineTape

Rig Wheels Passport

Abel Cine

Aerial Filmworks

Technodolly

Visual Products