Day 28 Flowering, Browning Bud, pictures, Help!

Ok so here are the facts

28 days in flowering, this plants has 19 colas. FloraNova Veg&Bloom/Karma/KoolBloom. My 250 HPS is 5" away from the plants and canopy temps are 25c-30c. Humidity goes from 40 in light to 60-70 at night.
Growing in soil less. My PH is close to 6.5(test tube ph tester)

After finally moving to 1100ppm full bloom nutes. Slow yellowing of fan leaves turned very rapid and is killing many of the lower fan leaves within 2-3 days. I flushed her on the next watering and noticed a slowdown of the yellowing, the plan is to add a little more N next feeding.

At first, two of the colas coming from the one node with most yellowing leaves developed some minor browning on the surface of the upper fan leaves. As of yesterday the edges of the highest leaves are turning orange/light brown as is the side of the bud. It doesn't rub off and is exclusively happening on these colas. All other colas are nice and green, no burning, or other signs except yellowing fan leaves below.

Can anyone chime in on what this might be and how I can stop it?

Thanks a lot

Fucking metric system.

I'm not sure, though.

In my opinion that has got to be a burn. The way its just right there on the tip, the look and coloration of it all point to burn. 5" may be too close ... or maybe you lifted the plant and touched the glass a bit. Looks pretty though. lol

5 inches is definitely too close. You're burning your plants. If it's hot for the back of your hand, it's too close

Defo thats burns.Scroggsy.

thats a boron problem. not nute burn jeez. nute burn is at the tips and goes from yellow to fried, its never brown...

dirtysnowball said:

thats a boron problem. not nute burn jeez. nute burn is at the tips and goes from yellow to fried, its never brown...

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Burned from HPS lighting

Thanks so much guys, maybe I touched the plant against the light when I pulled them out last time. I'm 3 months in and temps have never been an issue at 5" distance. It's barely warm on the back of my hand.

Should I just leave it "as is"?

thinkingreen said:

Thanks so much guys, maybe I touched the plant against the light when I pulled them out last time. I'm 3 months in and temps have never been an issue at 5" distance. It's barely warm on the back of my hand.

Should I just leave it "as is"?

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Well so long as your sure. Another sign of the light being too close can be heat stretch on the top colas. But if your sure it's not too hot then only you would know. Scroggsy.

Well, I'm a first timer. Everything looks bushy and short to me, but I'm not familiar with heat stretch. Here are more pictures, does this show heat problems?

No doesnt look bad to me apart from the yellowing, seems a bit early for that. scroggsy.

doesn't look too bad, but 5 inches is way to close. i suggest 12 inches.