In another forum a member said he had read that the lumens quoted on bulbs are the amount reaching a surface from one foot away, or in other words, a ft. candle. To get it's lux rating, one would divide by 10.54 (I think that's the amount).

My light meter seems to agree. Taking the reading from about five inches away, I get ~14,500 lux. At exactly six inches, ideally I should get a reading of 13,800, at about two feet I get ~3,000.

IME, 3,000 lumens hitting the leaves of the plant should be enough for seedlings though not enough to set and produce fruit for most plants.

Mike