dayLeit Lighting’s new revolutionary GrowLeit for indoor greenhouses. At 300W, it can replace up to a 820W high pressure sodium specialty grow lamp. It will last 50000 hrs (recommended due to lumen depreciation) rather than the 20000 hrs from competing technology. It’s design incorporates wavelengths in the red, yellow-orange, blue, and violet spectrum to maximize plant’s absorption of light in the photosynthetically active region (see en.wikipedia.org for a good introductory explanation). Red/Orange-Yellow and Blue/Violet are independently dimmable from 0-100% in our design, allowing for customers to find the perfect mixing for an individual plant species (each plant has slightly different pigment and thus absorbs these wavelengths in slightly different combinations). Lamps are instant on and duty cycling does not affect their lifespan. Thanks for viewing!