where I ′ is the light flux of a specific wavelength, λ, given in units of 1 m ⋅s. h is the Planck constant, k is the Boltzmann constant, c is the speed of light, and T emit is the emitter temperature. Thus, the light flux with wavelengths in a specific range can be found by integrating over the range. The peak wavelength is determined by the temperature, T emit based on Wien's displacement law :