Designed with Eye Health in Mind: Your eyes perform best in balanced, natural light, which is why OttLites exclusive ClearSun LED technology is designed to match the spectrum of the sun, reducing eyestrain up to 51%. ClearSun LEDs have a 95 Color Rendering Index (CRI), a measurement that reveals how accurately a light shows color on a scale of 1-100. Other lamps average a CRI of 83.