I already have plants under my 450w light and they are about 1 month old. I have new seedlings now and I am wondering if it would be ok to put them under the light with the older ones. I currently run the light 18 hours on and 6 off. I don't want to fry the babies.

Just keep them farther from the light for a few days. Bring them closer to the light gradually. 450what?

BTW. Welcome to GP

welcome :-D. keep those babies 3-4 ft away from that strong light for the first week or two. gradually move them closer as they begin to get more leaves.

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Just introduce them to the big light slowly and all should be fine. Start several feet away and then lower the light gradually.

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