Vegging and flowering questions

first 3 pictures are of a 3 week old plants under t8s.
about 75F 20% humid
what are their problems?



this is a plant is 3 weeks into flower.
A heat problem killed all the lower leafs and they are still not looking better.
under 1k HPS
about 85F, 20% humid

There is a site with pictures to help you diagnosis growery.org then go to diagnosis part. I don't know what it is.