Are two wide spectrum 2 foot plant growth / aquarium T-12 tubes (20 watts / 750 lumens each) sufficient for a for a 2'x2'x6' grow room?

I'm only planting 10 seeds in rockwool plugs in dome propogation tray.
I'll keep them under these lites for the whole veg. cycle also.

Is this enough wattage?
Would four T-12 tubes be really much better and worth athe added cost?

Home Depot said the 20 watts gives off more than a regular 20 watts (hard to understand this concept). Its the highest wattage they have for this type.
Thanks very much for your input.
Babcock307 Reviewed by Babcock307 on . Kind and wattage of seedling & veg lights Are two wide spectrum 2 foot plant growth / aquarium T-12 tubes (20 watts / 750 lumens each) sufficient for a for a 2'x2'x6' grow room? I'm only planting 10 seeds in rockwool plugs in dome propogation tray. I'll keep them under these lites for the whole veg. cycle also. Is this enough wattage? Would four T-12 tubes be really much better and worth athe added cost? Home Depot said the 20 watts gives off more than a regular 20 watts (hard to understand this concept). Its the highest Rating: 5