as long as you keep those tubes 1" from your babies they'll be alright, how are your temps? the extra light will be good, but if y0ur temps become a problem, the extra lights wont be very beneficial. Also do you have a fan blowing on your younglings? one more thing, dont get the 4200k cool whites, they're too white, you want something more blue like 5000 or 5500k, or even one 5000k and one 3000k would provide a more balanced spectrum, thats what I think:thumbsup: