I use 600w In my seedling/veg room. As long as you have proper distance your fine.
Same, although mine is dimmed down to 300w at the moment, I've got it over my 10 day old seedlings and they're loving it. Just make sure the light isn't too close and your ventilation is legit.
How old are they though? They look like they're about 7-10 days old? Not sure what you're worried about to be honest, they look pretty fine to me
It's easy to stress when your seeds aren't growing quick, but they rarely do. You aren't going to see much going on above the soil because your girls are still trying to get their roots going. Right now they need to focus on increasing the size of their taproot before you'll see anything going on up above.
If your seeds were 3+ weeks old and looking like that then I'd definitely be worried, but from what I'm seeing all is well.
I popped 15 seeds on the 27th of last month, I only have 5 sprouts out of the 15 seeds. Did you order the seeds from attitude? How did they look when you got them? Were they tiny and weak looking? Or were they big and stripped? Whenever I get seeds from a bud or anything of the sort, I always try to squish it between my thumb and index fingers. If I can't squeeze them, I know their good. The seeds I ordered looked like they wouldn't pass that test, with how they looked compared to some of mine, I'm surprised I even have 5 sprouts to tell you the truth. Just be patient my friend.