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11-30-2009 #1
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Verifying 100fc without a light meter
Is there a way to reliably verify that there is at least 100fc minimum of light without having a light meter on hand?
I don't have a light meter and may be challenged during an audit to prove that I have the minimum 100fc.
1970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
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12-01-2009 #2
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John,
You might try a google search for IEEE and Industrial Lighting Engineers guidelines...they may have some pointers. I would think that there are some formulas that can be used to calculate FC levels if you take into account the height and spacing of the poles, as well as the # and type (high-pressure sodium, metal haylide, etc) of lamps that are installed. I'll ask one of the electrical engineers here at work the next time I see one.
If you need a light meter reading, you might call a security consulting company in your area to come out and take light readings (I used to do this type of work as a consultant, but I've never tried to calculate levels without a meter).
12-01-2009 #3
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this might sound too laymen, but you might be able to find a light or lightbulb somewhere that is around 100fc, and compare the two outputs, you won't know the number but you'd know if it was higher or lower than what you've got.
12-01-2009 #4
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The Iphone has an App for that.... lol just kidding
JC Scott
12-01-2009 #5
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Well, I found that I "may" be able to use a visual comparator in the area where I am doing these inspections. The idea is to be able to read the text of a certain size font on a grey background. If you can visualy make out the text, then you have enough illumination to perform the required inspections. I may just try to build a light meter..I found several online diagrams and instructions to build one from parts found at Radio Shack...a photocell that produces a certain voltage at certain levels of white light, that can be measured with any ole multi-meter. But some of the welding codes require that this device be calibrated semi-annually.
1970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
12-02-2009 #6
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Grainger Industrial Supply has one listed on their website for less than $100. Hope this helps...
http://www.grainger.com/Grainger/lig...-bc3?op=search
12-02-2009 #7
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Excellent!...that is exactly what I was looking for at a price we can live with. Thank you for finding that for me. Everywhere that I had checked had them listed for much more money.
Originally Posted by CowboyBob
1970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
12-03-2009 #8
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I was actually trying to find one of our old ones here at the office for you to borrow (how could anyone resist that self portriat in your avatar?), but I couldn't locate them.
Glad to have been able to help you find one in a reasonable price range.
12-04-2009 #9
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Now my Level III NDT guy is questioning the accuracy requirements regarding the light meter in accordance with the weld inspection methods (MT and PT) that I will need to verify the light intensity for....uggh, I'm getting a headache over choosing a meter...LOL There ia Grainger store here in town and can have the meter in my hands in a few days, but now I'm waiting on my Level III NDT guy to be comfortable with the accuracy tolerances. I'm a Level II so I have to get everything approved through our Company's sub-contract Level III guy.
1970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
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