You need to block them from direct light, shading them with a bit of white card stops the light from heating the actual device so it only reads the air temp.
Even though led has low radiant heat. It can still throw off the readings
To me the yellow leaves look like you have got a nitrogen deficiency that is in it's late stages. And the small buds indicate you have a lack of light.
Yea I'm not sure how though because I used biobizz grow bloom and top max throughout the grow the problem only started 3 weeks ago and I have changed light from a 600 HP's to a 150 led so there is a difference in light but isn't a 150 led light enough for one plant ?
