Lights & water system are a good start but....Got Ventilation, Carbon filtration, De-humidifying gear? Nutrient wise I do my best to change my reservoir weekly, 20 gallons worth of water, about 10-plus tablespoons of liquid foods a week. Ideally speaking, 8 weeks = 8 changes = 80 tablespoons nutrients. 2 gallons Nutrient = 512 tablespoons. Big deal eh? A gallon of the veg & a gallon of the flower stuff I use goes for about $50 each. A lot O' tablespoons full, many crops worth. (actually 6.4 crops can be fed on $100 worth of Tiger bloom, big Bloom & Grow big. ) On average pennies a day. Basic liquid organics aren't that expensive and will improve your plants health! Skip the commercial stuff & gimicks...NO Miracle Gro, Super Thrive, or VF-11 . Your first plant will pay you back immediately for the expense of organics. Try it eh?! Happy Gardening! Best wishes, GrowIT!