you won't notice the difference.go for it. losing a few lumens is much better option than getting fluffy buds with lowered terpene profile and lower yield.
fruit grower no bud im running hps lighting at 600w but they generate nearly 65% of my room temperature so was going to fit tubes undershad and maybe keep 2 in closer canopy
By cool tubes, you mean cfl or t5. They generate very little heat and lumens are lost after a feet or two. Keep these bulbs with 6-9inches for best results 👍🌱