Note：1.Luminous intensity is measured with a light sensor and filter combination that approximates the CIE (Commission International De LEclairage) eye-response curve.
2.1/2 is the off-axis angle at which the luminous intensity is half the axial luminous and intensity.
3.The dominant wavelength, d is derived from the CIE chromaticity diagram and represents the single wavelength which defines the color of the device.
4.The IV gua