when do I change from a yellowish light to the blue light?????

[bowstaff97]

I'm growing and I need to know how many months after it starts growing do I change the light to a blue light?

[Schmokin]

You should change the light once the plants begin to flower. Thing is, you normally start with a blue/green light and finish off with a yellow/red light. But don't worry too much about that now. If the plants are thriving then stick with the blue light. There's some good info on marijuana lighting here. It's important to know about how cannabis uses light, but don't get too bogged down by all the technical stuff. If your plants are thriving then you should be a happy bunny.

[LYDIAhy1959]

depend on the status of your plant

yes, don't rely on theory so much, just some one experiences,
also need to depend on the status of your plant, take care them

[garylee]

You might want to use the blue light in vegging your plants. When it's time to flower then get both up. A more complete lighting spectrum plus the added advantage of more light itself will promote bigger, denser buds.
Good luck in your grow.

[Schmokin]

Nice pic Groot. Is that yours?