E-Series LED New E-Series LEDs are 15% brighter with the same wattage consumption, resulting in even better penetration and more intense shimmer. Shimmer Beautiful, unrivaled shimmer gives the look of natural sunlight in your aquatic garden. Spectrum Kessil is the only company to manufacture all LED arrays in-house with custom spectral blends specifically tailored to meet aquarist needs. Double Peak Leveraging years of Kessil's own grow light research, our LEDs now emit a "Double Peak" spectrum, which improves plant color and growth by enhancing photosynthetic absorption. Penetration Patented Dense Matrix LED™ technology concentrates multiple LED chips into an array, creating a powerful light source with better and deeper penetration, without sacrificing coverage. Color Mixing Different wavelengths within a single LED array are seamlessly blended before leaving the light, emitting a uniform color with widespread coverage. Controllable Compatible with 0~10V external controllers. Daisy-chain multiple lights for seamless control from a single source.