The main areas for development of standard conditions of measuring the illuminance are proposed, as a result of which the users of the luxmeters will receive characteristic Type B uncertainties for a wide range of standardized operating conditions. Within the scope of work, it is proposed to develop tabular spectral distributions of five groups of light sources. Among them are the following: standard spectra of type A, C, D50, D55, D65, D75; gas-discharge light sources with impurities and phosphors, LED sources based on white phosphor LEDs with correlated color temperatures from 2360 to 8300 K and monochromatic LEDs with emission bands 380–470 nm and 650–760 nm; sources of UV and IR radiation. For the latter group, it is proposed to develop the equipment based on the LED sources of UV and IR radiation as well as to develop a procedure for their use to characterize the non-suppressed sensitivity of the luxmeters beyond V(λ). For UV spectral range, the interval of UV radiation in sections A and B is proposed ‒ from 285 to 380 nm, which allows to take into account the characteristic maxima that exist for the bactericide and erythema. Due to the characteristic transmission cutoff of the glass and the widespread distribution of incandescent lamps, the radiation range from 760 to 2500 nm is proposed for IR range. In addition to the standard type A spectrum, it is proposed to add the standard source with a spectrum in the range from 760 to 860 nm for investigation of the non-suppressed responsivity in the IR region.In order to evaluate the uncertainty components associated with the periodic component of luminance, it is proposed to implement LED-based equipment and to develop a methodology for its use. In particular, to identify and standardize two main forms of the periodic signal during the study: sinusoidal and rectangular. A sinusoidal waveform with a frequency range from 5 to 300 Hz is required to determine the frequency dependence of the sensitivity of the luxmeter. To estimate the mean luminance values, it is proposed to use a rectangular waveform in the mode with changing duty cycles and a uniform signal distribution.