Abstract
Improvements in the energy efficiency of lighting should be made with due consideration of their impact on human visual performance and health. The improvement in efficiency is unlikely to have adverse effects, except when gas-discharge lighting is used with low-frequency control circuitry to replace incandescent sources. Good lighting design practice, particularly the use of daylight, can improve health without compromising efficiency. Concerns about the detrimental effects of uneven spectral power distribution and low-frequency magnetic fields are not as yet substantiated.
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