I know most people here are looking for more light, just because and I know it is a dumb question, but since I can not find it with google, I am hoping someone here knows the answer..
Is there a chart which states how many lumens are needed to:
Read in a perfectly dark room, for long periods vs. just enough light to make out a message
Enough light to see to do work.
Enough light to be seen over X amount of distance
Enough light for seeing a person at 20 yards, vs. 100 vs. 1000
Enough light to…and 100 more examples.