Wow, I need to update more pics! My babies are growing like mad now.

So, I found a 250W MH light & I'm about to buy a 150 or 400W HPS light. Is it really that bad to use both during all periods of growth (veg & flower)? I understand the color differences and all that, I was just wondering if anyone else has tried that.

Another question, when does everyone transplant their babies into bigger pots. Mine are in a 3" pot now & are about 2-3" tall. Should I transplant soon or what longer?