Actually it is a lot better to start the plants in smaller containers and work up. There are reasons for this--it is so much easier to get the correct amount of water and nutrients to them and it does not waste water, soil, and nutrients. If you are careful there is no reason that transplanted plants have to undergo any shock or stress. But keeping the correct amount of water to them when they arde strhis small and in that large a container is going to be hard. You have to water deep to get the roots to grow deep. It is also better for plants to be able to develop better root systems if they start out in smaller container and then you work up.
I also agree with JAAM that the smaller wattage bulbs are probably useless when using them with the 600W.