If it were me ... I would not use such a whooper of a light to start out with. Depending on the amount of money you have, spend a couple of tens and get some CFL's or Fluoro's to start with. That 1000 is way too much for a little-bitty seedling.
Get that started and for the time being, don't sweat the H202 just yet. Are you growing in soil, hydro, aero? Any and all info is much needed for the members on here to help you. We want to help you as much as we can, but we def need to have a little bit more of info to do so.
Also, read the many posts that are on here. I am sure that you will find the answer to a lot of questions, especially now that you are going solo. Always remember one thing also ... It is just a "weed" and is very hard to kill. They usually bounce back if you catch the problem quick enough.
Best of Luck
MaineYankee