An indoor horticultural system includes a grow bed and a lighting system arranged in proximity to the grow bed. The lighting system includes lighting fixtures having an optical axis and a light distribution whose intensity increases as the angle of the generated light increases in relation to the optical axis to increase cross-lighting. Alternately, the lighting system includes lighting fixtures mounted at varying angles and with varying beam widths so as to increase cross-lighting. Series connected light fixtures include a master light fixture that employs an intensity controller to control the intensity of light generated by each of the series-connected light fixtures, where the intensity controller derives operational power from an LED string contained within the master light fixture.