Photosynthesis is most pronounced in the red (600-680nm) and blue (380-480nm) wavelengths of light. Horticultural lighting, also know as High Intensity Discharge (HID) lighting is designed to cover these specific wavelengths. There are two types of HID lamps which emit different color spectrums. Metal Halide lamps emit a white/blue spectrum. MH lamps are best used as a primary light source (if no or little natural sunlight is available). This type of lamp promotes compact vegetative growth. There are also MH to HPS conversion bulbs available which allow you to provide MH light during vegetative growth and then switch over to the HPS for fruiting/flowering stages of growth. High pressure sodium lamps emit a yellow/orange spectrum. They are the best lamps available for secondary or supplementary lighting (used in conjunction with natural sunlight). This type of light promotes flowering/ budding in plants. HPS lamps are ideal for greenhouses and commercial growing applications. The Son Agro HPS lamps add an additional 30% blue factor to their spectrum, making them a better choice than straight HPS lamps for solo use. There are also HPS to MH conversion bulbs available which allow you to provide MH light during vegetative growth and then switch over to the HPS for fruiting/flowering stages of growth.
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