First of all, you don't want to flower the plants under a MH lamp, you want to use a HPS for flower. Find a conversion bulb that will burn a HPS lamp with a MH ballast and flower with the HPS.

One month is a pretty big head start. However, your GdP clones, by the very nature of clones, could be flowered now, so any waiting you do is strictly for size reason, not maturity.

With a 400w lamp, you want short plants, not tall ones, so you could trim the PK's a little. With the GdP's, put them up on something - an inverted pot, whatever - and get them elevated so they are getting the same light as the PK's.

...or, you could veg the GdP's under flouros, put them in the flower room when you feel they are ready and leave them flowering after you have harvested the PK's.

Then, learn from your experience and next time buy your clones all at the same time. :jointsmile:

PC :smokin: