Originally Posted by speedy petey
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.
I don't have a cell phone (or ATM card or credit card).
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.
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.