I don't think it matters if you look at it this way and assuming the feed is 3 phase 208v. The three phase temp wiring supplying the panel is good for 30x208x1.73= 10795 watts.
Again making assumptions that the lighting is 120v.
Phase A to lighting is good for 120x30=3600w
Same for phase B and C
Total of A.B& C is 3 x 3600=10800
Basically the same thing as above.
Keep in mind this does not take into account any other code rules such as 8-104, 30-712(2) or 76-014(4)
Alot of assumptions made here but not alot of detailed info supplied. It's just a way of illustrating how to make the calculation.
You will still have to take applicable code rules into consideration.
