Hmmmmm I don't veg with them but I have 1 24watt 2400 lumens sunblaze inside on each side of my cab I have 5 plants and 2 or 3 have been touching them and it has not hurt them, I guess it depends on the size of the plants possibly also my t5s have a protective plastic snap cover around the bulb so the leaves are not touching them so they are protected from the actual bulb. As long as you keep a eye on them and they have at least a inch or so of space between plant and bulb and there is no damage or crispy critters I'd say you are good, cheers mate. I hope I was able to help some what