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#1 Natalie Saito

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Posted 24 July 2007 - 12:34 AM

how powerful are HMIs (brightness)? how much more than tungsten? i'm trying to motivate moonlight from a window (about 12' x 24' area) the width of the balcony (to place lights is about 17', floor length) will a pair of 575w HMIs be sufficient to create the effect? 1.2k? thanks for reading! Natalie
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#2 Natalie Saito

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Posted 24 July 2007 - 01:02 AM

forgot to mention. possibly using transparent curtain. there are already vertical blinds but i don't really like them for the shot. thanks again.
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#3 Xavier Plaza

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Posted 24 July 2007 - 01:05 AM

how powerful are HMIs (brightness)? how much more than tungsten? i'm trying to motivate moonlight from a window (about 12' x 24' area) the width of the balcony (to place lights is about 17', floor length) will a pair of 575w HMIs be sufficient to create the effect? 1.2k? thanks for reading! Natalie



Hi Natalie, well HMI have about 5 times more useful light than tungsten lights, 1.2K HMI have similar power than 5K tungsten light. You can see the differences in Arri photometric chart (do it like exercise)
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#4 Natalie Saito

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Posted 24 July 2007 - 05:37 PM

Hi Natalie, well HMI have about 5 times more useful light than tungsten lights, 1.2K HMI have similar power than 5K tungsten light. You can see the differences in Arri photometric chart (do it like exercise)


thanks xavier. I just wanted to get an idea so i can figure out my equip list.
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#5 Chris Keth

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Posted 24 July 2007 - 08:58 PM

thanks xavier. I just wanted to get an idea so i can figure out my equip list.


5x sounds about right for a PAR fixture. For a fresnel, it's somewhat less, maybe 3x.
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#6 Xavier Plaza

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Posted 24 July 2007 - 09:12 PM

5x sounds about right for a PAR fixture. For a fresnel, it's somewhat less, maybe 3x.



yes, you`re right Chris i forgot specify PAR fixture...Natalie take a look on arri website the Arri photometric calculator...
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#7 Chris Keth

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Posted 24 July 2007 - 10:31 PM

yes, you`re right Chris i forgot specify PAR fixture...Natalie take a look on arri website the Arri photometric calculator...


Well, PARs are usually what I work with, too, so I forget both types exist. I just didn't want him planning one way and finding out another :)
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