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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => Lighting Forum => Topic started by: David Allred on January 31, 2019, 10:09:39 am

Title: Follow spot lumens (or Lux) chart for practicle use (Edited to 902)
Post by: David Allred on January 31, 2019, 10:09:39 am
Is there a guide or chart that specifies the functionality of a follow spot given certain ambient lighting condition (dark room, stage lighting (different colors possibly), back lighting in use etc)?
I want to stop lugging my bulky, heavy Altman 901 around and get an LED.  I am looking at the ADJ 60w follow spot.   The 902 far exceeds any thing I need.   I looked for data on it but have not been successful to do a comparison.  My use will be mostly dark room with minimal ambience (ballroom leadout settings), and some small color lit stages (8 wash fixtures). 
Any useful info about the ADJ fixture?


Thanks. 
Title: Re: Follow spot lumens (or Lux) chart for practicle use
Post by: Jerome Malsack on January 31, 2019, 12:39:46 pm
it is hard to say.  the best comparison would be to measure the lumens at the stage. 
I have the older Chuavet 400G  followspot that is 400 watt halogen bulb.  This works well for me
with 60 ft.  The DMX was also a big help. 
Title: Re: Follow spot lumens (or Lux) chart for practicle use
Post by: Mark Cadwallader on January 31, 2019, 02:32:12 pm
If the maker of the lighting instrument doesn't publish photometric data, all you can do is try using it to see if it is adequate for your needs.  Photometric specs might not tell the whole story, but you can get a reasonable idea on how instruments compare.  For myself, if I can't review photometric data, I don't bother with that fixture.
Title: Re: Follow spot lumens (or Lux) chart for practicle use
Post by: David Allred on January 31, 2019, 02:39:07 pm
If the maker of the lighting instrument doesn't publish photometric data, all you can do is try using it to see if it is adequate for your needs.  Photometric specs might not tell the whole story, but you can get a reasonable idea on how instruments compare.  For myself, if I can't review photometric data, I don't bother with that fixture.

The data I can't locate is of the Altman 902 I have.  I guess I could use the lux app I have on my tablet, but I'd much rather have published specs by the manufacturer.   I have the data for the LED fixture I am interested in.