Kessil is the only company to manufacture all LED arrays in-house with custom spectral blends specifically tailored to meet aquarist needs. A proprietary blend of UV light enhances coral growth and color. Patented Dense Matrix LEDâ„¢ technology concentrates multiple LED chips into an array, creating a powerful light source with better and deeper penetration, without sacrificing coverage. E-Series LEDs are 15% brighter. Different wavelengths within a single LED array are seamlessly blended before leaving the light, emitting a uniform color with widespread coverage. High performance and low maintenance. Simple and compact units feature quiet operation, innovative heat management and efficient, long-lasting LED construction. Tune the spectrum and intensity for a personalized look. Kessil Logicâ„¢ maintains consistent output across the spectrum. 10,000K to Actinic.