lighting, lux, digital cameras, light meters, incident light
Any photographers out there?
I may have a method for using a digital camera as a light meter.
White paper at 70 lux reflects 61% of the incident light.
Set your camera at ISO100 and take a picture of white paper in the incident light level to be measured with your existing lighting in kitchen, family room, whatever.
Convert your shutter speed and f stop of that photo to an exposure value.
Convert your exposure value to lux
Multiply by 1/0.61.
Upgrade or downgrade your lighting (watts, lumens) to suit.
Will this work?
Honestly not sure.
I am a hardcore amateur photographer. I have to say, the light meter app on my phone seems like MUCH less work. :)
Where I live many people are addicted to these gadgets. I saw one guy take one bite of his meal, then check his gadget, then another bite. . .
For me I guess the fun is in doing it myself from bits and pieces of what I already have. :rolleyes:
My test case will be two floodlights, both ~600 lumens & 120v, one from the market and the other from Grainger that is supposed to last 20,000 hours.
The long life bulb is noticeably dimmer.
I won't even need the white paper, just two photos of two couch cushions that these lights are over.
Then I guess I should check that the beam angle for both bulbs is the same.
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