By the way! Since most of you have the latest phones nowadays; would be interesting to see what Eye and others are getting in terms of lumens / squarecandles at canopy level and bud level.
I use Light Meter on Android and seems to do a decent job. The light sensor on your phone will obviously not be as accurate as an actual lux meter but will give an approx.
Having my led hit the scrog /buds at 40,000 lumens at the level of the tallest bud.