I'd imagine that the plants won't flower as quickly in the first week, but if there's going to be an HPS overhead soon, it'll probably make up for any time lost. Wire up the big light as soon as you can get your hands on it, and in the meantime, make sure your ventilation can handle a hotter burning light.

I don't see much (if any) flower production in the first week of 12/12 anyway, even using stronger lights right from the start. Good luck with your grow! :jointsmile: