COB LED Lux at canopy

Hi,

After doing a cfl grow the first time round I threw together a 350w cob led light. They are 50 watt bridgelux cobs and I am running them at 36 volts and 1.2 amps which is more or less the test specs that say they give out a typical 6000 lumens each. So I have 7.

Im thinking there is an issue with the lights, I have downloaded 2 different android light meters and they are both saying that my lux at the canopy is 6-7000 pretty consistantly. The lights are 0.8m above the plants. Around 0.5m below the lights I am reading 20-26000 lux and like 10cm below 100000.

I have read that I need about 50'000 lux for vigorous growth.

Can anyone say if this is correct. And can someone with a 400w hps advise what lux they are getting at the top of their canopy when the lights are far enough away to not cause heat stress so I have something to compare it too.

Could be the light sensor on your phone, I was playing around with one also a couple of days ago. 200 watt was showing approx 22,000 lux at 32" away. Not sure how accurate these apps are, try it on a different phone and check some readings. For vegging 22,000 does the trick.

Why do you think there is an issue?

The question is, where does bridgelux take their readings from (ie distance)?