black spot, shadow

[Rusty Trichome]

what is that mean radar range?

Amana Radar Range. A microwave oven with a stainless steel interior.

temp is 25 on tops, humidity is 45, before was 30

25 to 30 c. (77 - 86 f.) is fine. Personally, I prefer slightly higher temps to begin with. (I live in the desert...check the Dealing with Heat Issues link in my signature) I never spray my ladies. If they aren't getting the moisture from root uptake, they don't get it. (they adjust just fine if allowed to do so)

i mixed 1/4 worm castings and 1/4 perlite

What did you mix the 25% perlite and the 25% castings into? If the potting mix you use already has castings or another nitrogen source, it might well be overkill. But my main concern would be the results from too much of the worm castings making your medium too muddy though. Retains water, locks-out air and gasses necessary for roots, and root rot will develop if not letting soil dry between waterings.

should i go lower with lamp, if temp is not higher than 25 on top of plants?
thank u

Tiz up to you and your plants. Is your 600w in a cool tube?
Are you in the middle of summer, or the middle of winter?