If under an HPS, and with a 1k HPS I'd keep it pretty far away from the canopy to begin with, you'll get much more stretch than you would with a MH. Generally, within the first week of being under 12/12 with an HPS, my side shoots nearly catch up to the main cola area. This isn't always desirable, but for taking clones, it's my preference.

Take care. :jointsmile: