Are These Stretching Too Much Under New 315 Cmh?

Hello all, I bought a 315 watt cmh light last weekend and I have to say so far I am really liking this light. I can hold my bare hand 6 to 8 inches below the light for ever without any issue. My older seedlings(couple weeks old) seemed to have really started kicking under this new light. I have the light about 56 inches above plants because of paranoia on my part when it comes to burning them. My question is do you think my new seedlings in the red solo cups (which are about 4 days old) look ok or do they look like they are stretching? Thanks all.