What your eyes are seeing is a different way to view the light and is not a defect of the bulb. The lumen output of each smart bulb applies to the Correlated Color Temperature (CCT) scale, 2700K to 5000K for instance, and does not apply to the RGB (rainbow colors) output. On some RGB colors, the brightness is slightly lowered to retain color saturation and enhance the color.Smart bulbs are designed with tunable white light for bright illumination are ideal for task lighting. RGB colors to help you establish an ambiance or mood.CCT is a way to measure a light’s appearance in the warm or cool tones of the light emitted. You can learn more about color temperature in our blogs, Color Temperature Applications and Kelvin Levels Explained or The Color of Light & CCT. You can also learn more about the properties of light in our blog Understanding the Visible Light Spectrum and Color.