HELP whats happening to m clones ?! PICTURES?

hello i have had these for about a week now and they have not been doing to good the lower leaves have gone yellowy and some of them have what looks like burns ..... THE PHOTOS R NOT BRILIANT BUT ANY HELP IS APRECIATED , they are in a propgator with the dome on and the light is a 600W about 3-4 foot above the plant

That first one looks like it had an embolism and is dead, the rest look ok, i usually cut all my leaves in half so that they don't lose so much water through transpiration. In rockwool you will see yellowing and some black spots appear, all pretty normal. If there aren't any roots by 3 weeks you might have to try again.

You burned the shit outta them lil things. 600W ru crazy?

i only have a 600W but bear in mind it is about 4 foot above i have a digi ballast that i could turn down to 400w and lower is thatb worth using?