Just flipping to 12/12 bud sites a lot lighter?

Switched over to 12/12 About a week ago and bud sites have went lighter green/yellow, maybe not so much yellow, only showing on bud sites and new growth about a node under. is this the usual colour when the plants are growing had the same thing during veg and all was normal, have no sign of deficiency and plants are healthy,
600w hps
Coco feeding a and b 2ml per litre
2ml boost per litre and calmag water from 0ec to 0.4 ec
Ph is 5.9/6

Anyone ?

Light green new growth is normal.

Could be sulfur def. I foliar feed epsom salt if my coco plants start doing it.

TreeFarmerCharlie said:

Light green new growth is normal.

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Gemtree said:

Could be sulfur def. I foliar feed epsom salt if my coco plants start doing it.

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Ive decided to give the plants a small dose of Epsom salts this morning, took my ec of calmag to .2 instead of .4 and added the Salts to around 0.5ec so feed hasn’t changed much just replaced but of calmag with the salts hope for the best!

Doesn’t look like anything to be overly concerned with right now.