I know that there are t5, t8 and t12's manufactured specifically for budding. The last time I bought these tubes(gro"n"sho) they were about five bucks each canadian in 1987. I can only imagine that they would be way more expensive now. I abandoned them because the price of them and the price of hps are about the same, once you add it all up. They put out a spectrum much light hps.