In addition to cost of lighting, I've found that the cost of hydroponic fertilizer is also too high, at least for small growers buying it premixed. I've success

In addition to cost of lighting, I've found that the cost of hydroponic fertilizer is also too high, at least for small growers buying it premixed. I've successfully grown hydroponic tomatoes following standard guidelines, and found that the cost of the fertilizer is roughly equal to the value of the tomatoes harvested.