Top growth pale flowering

Hi guys ,
I am having problems with top pale leaves . they are about 3 week into flowering .They started doing this after I started the bloom nutrient . It's a soil grow with added compost mixed in(maybe too much) .
I was wondering if that could be light burn from my led ? The highest cola is at 16.5 inch under my aglex 1200 cob grow light .
Else what you guys think ?

Thanks ! This is my first grow btw

You have a lot of stuff on your leaves is that dirt, damage, or bugs? Have you tested your ph in the soil? Have you tested your runoff for ph and ppm? Should be moving the light up as the plants grow. I usually keep my lights 16 to 24 inchs above the canopy. Since I dont have a lot of info it's almost impossible to give you a reason why its happening. But it looks like you have a couple issues. Try and give us some more detail and closer pics of the tops. What's the temp day and night? Humidity? Ph of soil? Ph of water being fed? Runoff test for ph and ppm if possible. Temp at canopy level.

When did you switch over to bloom nutes?

Hi guys , Thanks for the input .
1- There is some cinnamon powder / cayenne that I sprayed due to thrips earlier while vegging . I shouldn't have put that much but it seemed to have worked .
2- I did a big flush 10/10/19 with ph 8 water . The run off was phed at 6.2. Ppm run off was 400 . My tap water is 50 ppm .
3- Fertilizer ph is around 6.2
4-rh 38 to 52÷
5-temp 20 to 26 cielsus
6- I can't lift my light higher due to small tent 2x4x5
7- it's Been three weeks since the bloom nutes started

I don’t start bloom nutes till late in stretch. Maybe the start of k deficiency Also CaMag. They look pretty nice.

Plants don’t look too bad buddy. I would bring your water pH up to at least 6.5
I I would also give a dose of calcium, magnesium seems OK I don’t see any edge is turning purple or dying

I don’t use bottled nudes i use Epson salt or dolomite lime

What is that you're growing in? It looks like shredded wood.

You probably over fed with the bloom nutes.

And don't waste time checking the runoff and flushing to get the runoff where you think it should be. Chasing runoff is a good way to screw up your plants.

I just bought a lux meter to make sure my lights are at a good height for the plants, theyre pretty cheap on amazon and would be a good way to take the guess work out of it possibly being light burn.

Might be a little late for it this time but I'm sure this won't be your last grow.

I am growing in soil mixed with compost/wormcast/perlite.I just bought some cal/mag and will feed with a low ppm bloom nute. What Ppm would you guys recommend for feeding in soil ? I went cheap with some miracle grow 15/30/15 .Miracle grow 24-8-16 worked pretty well while in vegative stage . What could have made most of my top leaf become lime green? How much lux from my led approximate would be enough ?

Thanks alot guys

I wen't by the recommendations of this site


Says max 70,000 in veg and 85,000 in flower... A little lower for leds because they produce light it doesn't register apparently but not by much