how to determine foot candles with digital camera? - Orchid Board

armagedon48 · #1 04-07-2007, 01:42 AM

i saw in a book i was flipping through that you can use a digital camera to find out the foot candles or lumens.

any aditional info is welcome!

-chad

Tindomul · #2 04-07-2007, 01:43 AM

Same here, would like to know more for sure!

orcdfrk · #3 04-07-2007, 01:58 AM

how about just spend $25 and get a lightmeter? http://www.leevalley.com/garden/page...13&cat=2,50560

Elena · #4 04-07-2007, 08:08 AM

My camera shows fstop and exposure so I just set ISO to 100, make sure white fills the whole frame and then calculate using this

Shadow · #5 04-07-2007, 10:32 AM

I think the light meter is more accurate, more easy to use and it doesn't cost a lot. I've bought one and I'm very happy with it.

Ray · #6 04-07-2007, 11:34 AM

Link to article on Light Intensity Measurement

karla · #7 04-09-2007, 09:57 AM

is it possible and how to measure light intensity with external light sensor

roger nutt · #8 04-09-2007, 11:14 AM

Hi,
I bought a light meter for £15, they are very good.

fieldsofgold · #9 02-10-2009, 09:38 PM

Thanks so much Elena for the link! I read in Gordon's Orchid book about using a light meter but the information was back in 1985.

beanluc · #10 02-11-2009, 12:46 AM

Quote:

Originally Posted by armagedon48

you can use a digital camera to find out the foot candles

I did that for a minute last year. A Wikipedia article (on "footcandles" I think) had a table showing the relationships between Fstops, ISO speed, shutter time, and footcandles. I was able to make it work and get accurate measurements.

Then I got a light meter.