150 watts hps n 90 watts flourescent

I have a plant in the 3rd week of flowering stage. It gets 4 hours of strong sunlight since I live near the equator and in a tropical country and 8 hours of 150 watts hps/90 watts flourescent. This is my 3rd attempt at having a good harvest. the first 2 didn't use any fertilizer and the result were just dead leaves during the flowering stage. Now I'm using fertilizer for both the veg. stage and flowering stage. So kind of confident that it'll be a good harvest.

Question: Is it ok to switch from the amount of light I have(150 hps n 90 flourescent and 8 hours) and transferring it to balcony (4 hours) ? Will it put stress on the plant? Do you think it'll produce good buds?

First introducing your plant to the sun will be the hardest part on it. Slowly introduce her to the sun and everyday you can gradually let her take more and more. Eventually she will be just fine doing that and you will be rewarded from the sun.

Just remember doing so can also introduce insects into your grow room via that plant. Keep an eye out for bugs.