The Resistance is the world's ultimate optical tool for growers. It is the first grow glass providing "Perfect Color". The patent pending Rendition Technology was developed so people who work under the harsh conditions of High Pressure Sodium Lighting (HPS) can protect their eyes and see the full range of natural colors. HPS lights are the most efficient and powerful light sources on the market for growing indoor plants. However, because these lights make everything look yellow, it is nearly impossible to evaluate the well being of plants when viewed under this lighting. Using Method Seven lenses you can see the natural colors of plants being grown under HPS Lighting conditions.