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Light Meters

AVSCraig

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Light Meters
« on: February 14, 2017, 12:58:17 PM »
I have an AEMC CA813 light meter that has worked well. I've had it for several years now though, which made me wonder if it was still accurate. I was going to get it calibrated, but that's not cheap, so I ordered a Sper Scientific 840020 Light Meter with a Certificate of Calibration Traceable to N.I.S.T. - not too expensive on Amazon. Anyway, so far, they both read identical numbers. Sothe good news is my AEMC CA813 is apparently just as accurate as the new light meter with an N.I.S.T. certificate ! 

I'll test it out further tomorrow ( watching " Amelie " for Valentines Day tonight ) !

Links -

http://www.aemc.com/products/html/moreinfo.asp?id=70103&dbname=products

http://www.sperdirect.com/light-meter-lux-fc-296-prd1.htm

If anyone has experience with other light meters, post it here. Now I can say that the DR light meter brought here reads higher for sure.
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TWISM

Re: Light Meters
« Reply #1 on: February 14, 2017, 09:46:20 PM »
I too have the same CA813 meter, it's good to hear that yours is spot on, gives me hope mine is to.

AVSCraig

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Re: Light Meters
« Reply #2 on: February 14, 2017, 09:52:28 PM »
I too have the same CA813 meter, it's good to hear that yours is spot on, gives me hope mine is to.

I think mine is 7 or 8 years old too.
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AVSCraig

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Re: Light Meters
« Reply #3 on: March 22, 2017, 08:42:11 AM »
I too have the same CA813 meter, it's good to hear that yours is spot on, gives me hope mine is to.

Further testing revealed that they don't read the same, except on the kitchen counter, under an incandescent light. In front of my projector, the CA813 reads way low. The new light meter has a certificate of compliance, so I'm officially saying the CA813 is off.
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cjake

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Re: Light Meters
« Reply #4 on: March 22, 2017, 02:33:24 PM »
I just placed an order for the "C for certificate" version of the Sper Scientific 840020 Light Meter from Amazon.
CJ

Re: Light Meters
« Reply #5 on: June 24, 2017, 09:33:14 AM »
Craig, which 'source' setting do you use your 840020 on?  Choices are florescent, mercury, sodium and tungsten/unknown.  If I use the latter I get a much lower reading than my CA813.
I love the smell of projector in the morning!

AVSCraig

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Re: Light Meters
« Reply #6 on: June 24, 2017, 11:07:24 AM »
Craig, which 'source' setting do you use your 840020 on?  Choices are florescent, mercury, sodium and tungsten/unknown.  If I use the latter I get a much lower reading than my CA813.

Mine doesn't have a source choice - http://www.sperdirect.com/scart/public/database/repository/other/Instruction_Manuals/840020-i.pdf
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AVSCraig

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Re: Light Meters
« Reply #7 on: June 24, 2017, 11:09:56 AM »
Direct (585) 671-2972   craig@avscience.com
www.avscience.com
We carry projectors, screens, speakers, receivers etc. !!
Twitter - @AVS_Craig

Re: Light Meters
« Reply #8 on: June 24, 2017, 12:00:59 PM »
Did you get a 840022 ? http://www.sperdirect.com/scart/public/database/repository/other/Instruction_Manuals/840022-i.pdf
You might call Sper and ask them.

Ahh, yes, mine is a 840022.  Thanks, I'll ask them.
I love the smell of projector in the morning!