Behavior of plant with new light after flowering

Hello y'all,

I got 2 plants, sativa, got 2 months in vegetative with a shit light setup and the sun, then I turned off the lights during night hours for a approx 12-12 cycle, they went in flowering decently.

However, a friend of mine has a 600w light, if I put my plants under it following the same 12-12 cycle, will the added light fuck up their flowering or is it fine?

My issue being that my sativas are pretty high and I can't get enough sunlight on them for enough hours (indoor).

Thanks,
Me

They will adjust to the new lights quickly and benefit from them.

Bugeye said:

They will adjust to the new lights quickly and benefit from them.

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Thanks !