I would use the light that you have for the first bit.. it should get you by for a little while. I would def recommend moving up in light though... maybe saving your pennies and upgrading to a 250w hps ...Budget - Quality HPS Starter Light Range or something like this... I prefered air cooled but this would work fine... im not sure how much that is in us dollars.. but you should be able to find one for a decent price... even look on classified pages... like our "craigslist" and see if you can find someoen that upgraded and is getting rid of a decent light... Miracle grow is the "walmart" of farming... they are just the house hold name... I would stay organic though thats for sure! gl!