Turn 400 watt on also?

Indoor Growing Grow Room
1

A question from a fellow grower:

I’m a newbie to growing indoors, always grew outside. Summer is to short and winter lasts forever here. It’s super nice to see something green growing in the middle of a cold winter.
First, Thank you so much for the growers bible! I have read it cover to cover, more than once. So now I have successfully started my garden. Upgraded my lighting and have a tent coming with proper venting.
Are my seedlings in veg if they have three sets of leaves? Here’s what I did today. I had two 55w 6400K flourescent bulbs on two seedlings, one is further along than the other by about 1/4 inch. Should I turn on my 400 watt also? It’s dimmable to 200 watt? If not tell me today…as its ON now.

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Yes leave on your hps bulb and no vegitative growth begins at 4th node. With 3 days of lead nodes out that’s the last stage of a seedling. Also what’s the space your using that could help determine on or off and to dim or not

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Germinatiom stage is – 7-10 days
Seedling stage is - 1-2 weeks

when there are 4 sets of “true” leaves - can switch light - you can do sooner but move light’s further from the plants. agree with “Majiktoker” also