Zoo Med Flora Sun Maximum Plant Growth Bulb is a high intensity lamp with peak emissions in the blue and red regions to maximize the photo biological processes in plants. The emission spectrum closely resembles the absorption curve of chlorophyll-A, promoting maximum photosynthesis, ideal for planted aquariums, or terrariums. Also great for shy fish species such as dwarf cichlids, discus, etc. Use in conjunction with Ultra Sun or Tropic Sun. Zoo Med's line of fluorescent aquarium lamps are made in Europe for ultra high quality, color, and longer burn life. Zoo Med's energy saving T-8 sizes can save you up to $30.00 per year in electricity over the thicker T-12 size lamps! Effective up to 10,000 hours.