Experimental study on brightness perception changing effect of pulsed light in short wavelengths

Abstract

Visual perception of pulsed light (PL) in wavelength of 400 nm–500 nm with different duty ratio (Dr) was studied. The pulsed light frequency was set as 100Hz, above human critical fusion frequency (CFF). Based on self-built experiment system, Brightness Changing Factor (BCF) values was defined and calculated via a quantitative measure for visual perception of pulsed light. We found some Brightness Reduction effects on visual perception of PL at certain wavelength, in addition to the general Brightness Enhancement effects found by previous research. Further, logarithmic function fitting between BCF values and duty ratio in different wavelengths was conducted. Finally, we propose a modulated spectral luminous efficiency function (Vp(λ)) of PL based on the logarithmic fitting and make a discussion on the relationship between the BCF and the physiological basis of human vision.