Choosing the ideal spectrum for LED grow lights involves considering the growth stage of plants and desired outcomes. Blue light (400-500 nm) promotes robust vegetative growth, while red light (600-700 nm) is crucial for flowering. Many growers prefer a balanced full spectrum with added green and far-red wavelengths for overall plant health. UV and IR light can also have positive effects. Adjustable spectrum settings, along with proper light intensity, duration, and cycles, play key roles in optimizing plant growth and yields. Monitoring and adjusting these factors are essential, with recommendations from California Lightworks in mind.