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HMI's and Par lights


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#1 William Siegel

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Posted 30 November 2007 - 05:48 PM

What are HMI lights, and what color temperature are they for, and are they used more for certain conditions rather than tungsten? also if color correction is needed what gel/s would you use to correct for this? This also goes for par lights?
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#2 Matthew Parnell

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Posted 30 November 2007 - 07:28 PM

Please use the search function for more info, all this has been talked about time and time again.

HMI fixtures generally are 5600K(daylight)- use a Full CTO Gel (Lee 204) to correct to tungsten.
Tungsten fixtures general are 3200K- use a Full CTB Gel (Lee 201) to correct to Daylight.
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#3 Michael Nash

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Posted 30 November 2007 - 07:54 PM

http://en.wikipedia....dium-arc_iodide

http://en.wikipedia....ctor#PAR_lights
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#4 David Mullen ASC

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Posted 30 November 2007 - 07:56 PM

PAR = Parabolic Aluminized Reflector. See:
http://en.wikipedia....ctor#PAR_lights

It's a sealed unit containing the reflector, filament, and lens -- a car headlamp is a common example. They can be either HMI or tungsten.
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#5 Richard Andrewski

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Posted 01 December 2007 - 04:20 AM

Actually only Osram makes "HMI" brand bulbs and they are all 6000K color temperature. Other manufacturers like Philips make clone bulbs but while many call them an "HMI" they are not. Philips are MSI, GE or CSI, etc. Only a few brands have actual 5600K color temperature and CRI on any of them can vary from 80 to 95.
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#6 seth christian

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Posted 01 December 2007 - 08:51 PM

I think the man is asking "What is the purpose of HMIs" not just what they are.
.

even so, HMI can be used for a very wide variety of things...but the most common might be used for day scenes because they
are powerful enough to penetrate in midday. they've been used to light up a forest, a parking garage, or a scene where the
light needs to travel a long way, just about anything that
calls for anything beyond 800 watts. they call for a lot of power source like a big generator to push the sufficient
amps needed.
so there's no specific purpose per say with using an HMI, its whatever you want it for, but they are TRUE in power as opposed
to the weak "yellow" tungsten lights that say 1000watts you can buy at HomeDepot for instance. HMI's project differntly with a
lens and you get reliable/consentrated light.

Edited by seth christian, 01 December 2007 - 08:56 PM.

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#7 Sam Kim

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Posted 03 December 2007 - 02:21 AM

I think the man is asking "What is the purpose of HMIs" not just what they are.
.

even so, HMI can be used for a very wide variety of things...but the most common might be used for day scenes because they
are powerful enough to penetrate in midday. they've been used to light up a forest, a parking garage, or a scene where the
light needs to travel a long way, just about anything that
calls for anything beyond 800 watts. they call for a lot of power source like a big generator to push the sufficient
amps needed.
so there's no specific purpose per say with using an HMI, its whatever you want it for, but they are TRUE in power as opposed
to the weak "yellow" tungsten lights that say 1000watts you can buy at HomeDepot for instance. HMI's project differntly with a
lens and you get reliable/consentrated light.


not always HUGe amounts of power it all depends on the light you're trying to use. HMI's start as small as 200watts and up. However they produce more lights than tungstens. a 200 watt arri HMI+ is more equivalent to a 1k watt junior. they have more output and are at different temperatures.

they're more costly but give you more light.

search next time =]
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rebotnix Technologies

Rig Wheels Passport

Aerial Filmworks

Ritter Battery

Media Blackout - Custom Cables and AKS

Glidecam

Broadcast Solutions Inc

Tai Audio

CineTape

Metropolis Post

Visual Products

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New Pro Video - New and Used Equipment

Willys Widgets

Technodolly

Gamma Ray Digital Inc

FJS International, LLC

Wooden Camera