Red and Blue LED Lighting for Indoor Plant Growth

Plants use primarily red and blue wavelengths for photosynthesis; green light is reflected (hence green leaves). LEDs can be tuned to emit only these spectra, giving plants efficient energy without wasted light. Fluorescent tubes can't be spectrally tuned. Building a custom red/blue LED array is complex; buying a ready-made horticultural LED system from hydroponic or aquarium suppliers is smarter. Higher upfront cost, but lower long-term energy use.