IES LM-90-20 PDF Download

The IES LM-90-20 standard is an approved method that outlines the procedures for measuring luminous flux waveforms for use in temporal light artifact (TLA) calculations. TLA refers to the cyclic variations in luminous output from a light source or lighting system, which can have an impact on visual perception, cognition, and brain activity.

This standard aims to address the effects of TLA by providing guidelines for measuring luminous flux waveforms under standard conditions. It includes information on the method of measurement, equipment requirements, and formulation of luminous flux waveforms for use in TLA calculations. The standard covers luminous flux frequencies between 1 Hz and 3,000 Hz under various control conditions.

Additionally, the standard specifies the data reporting formats to be used when reporting the results of the luminous flux waveform measurements. It is important to note that this standard does not cover intentionally flashing or signaling lights outside the defined frequency range.