Hola!

If they're tiny/small, an HID is not the most 'economical' way to do it... yet there is not reason why it cannot be used.

Zandor would run his germinating seeds 24/0 so when they popped, they encountered light.

Once you're on your 5th set (if I am not mistaken) of leaves, you can start giving them nutrients.
The light per-se, I would go for the HID as soon as you start to see them stretch.
Remember it is a WEED. Weeds grow tall... they like that.

How much time since they popped from the seed?

Best!,

-turtle420
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