when shud i transplant my seedlings into the nuted buckets?

shes like 3 inches and 3 weeks old. Also when should i switch to 400w hps lights i have mh bulb too but i read that i could use hps the whole time.

If the leaves are a healthy green you could wait another week or more, but I don't care much about them being put into soil with slow release fertilizers (which I believe you were saying, but I might have been wrong.) A quality soil without nutrients already in it is preferable. That way you feed your plants the right things at the right times and you can adjust if needed.

You could have started out your seedlings under your 400-watt using your MH bulb, hopefully a 6500K one, so you could switch it anytime you feel like it. As long as you always leave enough space/height between your light and the tops of your plants so you do not create a heat issue your plants will love the extra light.

Use the HPS for flowering, that is what it does best, flowers, and MH is better for vegetative growth (especially if the bulb is a 6500K bulb or at least as close to that as you can get).

I always get that confused. the 6500k is the colour temperature and 16000 lumens (which most 400w MH produce i believe) is the amount of light it projects? So 400w HPS gives a 2700k colour temp but more lumens that MH. ahh science haha

Slurpy said:

I always get that confused. the 6500k is the colour temperature and 16000 lumens (which most 400w MH produce i believe) is the amount of light it projects? So 400w HPS gives a 2700k colour temp but more lumens that MH. ahh science haha

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dont think too much, the science of marijuana cultivation is really not hard at all, wants you get the infomoration down, its a breeze to talk about.

Slurpy said:

I always get that confused. the 6500k is the colour temperature and 16000 lumens (which most 400w MH produce i believe) is the amount of light it projects? So 400w HPS gives a 2700k colour temp but more lumens that MH. ahh science haha

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Since lumens do vary from manufacturer to manufacturer the thing to keep in mind is color temperature and a vegetative phase of growth mainly uses blue so a 6500K, or as close to it as you can get and that means MH, and HPS gives more of the color spectrum the plants use most while flowering so that's what it's used.

Brick Top said:

Since lumens do vary from manufacturer to manufacturer the thing to keep in mind is color temperature and a vegetative phase of growth mainly uses blue so a 6500K, or as close to it as you can get and that means MH, and HPS gives more of the color spectrum the plants use most while flowering so that's what it's used.

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you can however use and HPS for veg though can you not? I thought i've heard of people doing this...

i got a recipe for subcool's super soil of the internet

n ya the mh is 6500k

Slurpy said:

you can however use and HPS for veg though can you not? I thought i've heard of people doing this...

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Sure you can. The plants will stretch more, the nodal spacing will be wider, but sure, you can use one, if you want to. You can also use a MH bulb from start to finish if someone wants to. But I wouldn't suggest anyone doing either of those things if they have the option to instead do it right, or at least closer to right, like if a MH conversion bulb would be someone's only MH option to improve on vegging with a HPS bulb.