We are using 2 hydrofarms with 2 600 watt lamps. Everything does fantastic until after the plants begin to bloom. About three weeks after we see the first flowers the plants turn lime green and then go yellow AT THE TOPS OF THE PLANT. We are at a loss. Could the lights be too close together or too low? We have addressed Ph, we have addressed nutrient lockout, what are we doing wrong? Any advice will help.

I can think of a couple of possibilities.

What is the temp at the top of the plants? Is there good fresh air flow?

What nutes and at what amounts?

Have you changed the res?

HTH

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what hydro system are you using, what is the temp, what kind of nuts you using, what is the PH, what is the PPM, You give little to no info, how can these people help you with no info.

Personally, I think you neighbors wife is coming over and having sexual in counters with your plants and killing them off.

yellowing of new growth could be a sign of sulphur (S) deficiency but that is pretty rare. More likely, the leaves are bleaching because the HID lights are too close. Put your hand in there - if it is too hot to hold there then it is too hot for the plants.

Nutes 1100 tdh

temp @ top of plants reads 76 but I dont trust that getting new thermometer today

Yes every two weeks we change resivoir

Ph between 6 and 6.5 usually can drop to 5.5 at times

Thanks

just goin by what ive read hear but your ph should be 5.6-6.0 no higher,and whats the resivoir temp

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I keep my PH at 5.8-6.0.. 5.8 seems to be my magic # lol
Try not to add to much PH up or down either if you cant get the Ph right change res.

A few pics would really help.