Many grow lights boast to be the best, with different PAR and power ratings and light spectra complicating the choice. To help growers understand how plants absorb artificial light and how grow lights produce photosynthetically active radiation (PAR), we have prepared this infographic which compares 4 of the most popular types of grow light: excite LED, High-Pressure Sodium (HPS), Fluorescent (FL) and Plasma (LEP). To compare them we look at measures such as PAR, PPFD (Photosynthetic Photon Flux Density), and power rating to measure the overall efficiency.

Infographic source: exciteled