Stealth Hydro Dual Spectrum II High Output Fluorescent Light Kit The dual spectrum II lighting system provides a monsterous 8400 lumens which supports both vegetative growth and flowering phases. At Stealth Hydro, we do as the name says, and stealth means low heat. Our lights produce the least amount of heat of any grow light system on the market today. This means you can place these lights into any small corner or stealthy closet without heat troubles that most other lighting systems have. Included are two rugged, fully assembled, completely wired, 11 inch rounded parabolic reflectors.