Hi Captain-Hardcore (CH),
It's hardw to say with any certainty without a pics and some more info on your set up.
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CH ....im groeing kc 39 in canna under a 150w envirolite and they ar einto there first week of veg
They are young - 1 week & possibly only have there first set of leaves poped open.
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HC....everything seems to be going fine but the leafs at the bottom of the plant seem to be shriveling up and turning yellow
If the leaves are the small oval shpes ones at the very bottom of your seedling all is normal. the plant from seed will have enough stored nutrients to last approximate;ly 2 - 3 weeks. It will loose/use the stored nitrogen in those small leaves.
By "Canna" do you mean your using Canna Coco as your medium (compost)?
You've said your using a 150w enviro. Can you let us know if you mean a 150w HPS or an envirolight set (fluro tubes)?
The difference is alot when it comes 4to light distance and heat/ventalat4ion control.
All the best CH
NK.