The light spectrum of the sun is so much healthier and you should not have a problem from the sun. When you switch indoor spectrums you can run into problems as it can cause stress. HPS is not as balance as most MHs so even though harvest is tripped faster the plants may not be growing to potential. There are many different bulbs though so obviously this is a broad statment. Stinky is a good grower no doubt.

If its 12 feet its sativa