of course you can, if you want to suffer less penetration, less photosynthesis, less yield....go for it, makes less heat, thats a positive
U don't like LED??? KIND 750 isn't better than 600hps??
Day 25 of Flower can I go from a 600hps to the 750 kind LED??
Yes you will be fine. Although you may suffer a slightly lower yield. Nothing too drastic. Don't let people get you caught up in the The Great LED Debate. If you need to make the switch it will be fine.
from my personal experiences using cree cobs coming from horti super hps's, my yeilds are high per watt used, & my electricity bill is lower...Damn I thought yield would be higher