Too much light is being used in ordinary work for the comfort and welfare of the eye with reflectors that introduce harmful brilliancies¶

Claim · All claims
Evidence · 1 study · causal r2 · q3
Currency · newest study 1917 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i? With semi-indirect reflectors of low and medium density and direct reflectors presenting excessive brilliancy, the amount of light used in ordinary work exceeds what the eye's comfort and welfare allow. → C. E. Ferree and Gertrude Rand 1917

Evidence¶

C. E. Ferree and Gertrude Rand 1917¶

C. E. Ferree and Gertrude Rand. (1917). The Power of the Eye to Sustain Clear Seeing Under Different Conditions of Lighting. The Journal of Educational Psychology. https://doi.org/10.1037/h0072369

q3 · i? · causal · r2

Result of the acuity-sustain tests for semi-indirect reflectors of low and medium density and direct reflectors with excessive brilliancy from opening, surface, or partly exposed source. The authors state means have not yet been found to produce this light without harmful brilliancies.

"our results show unquestionabfy, that too much light is being used in ordinary work for the comfort and welfare of the eye"

Discussion¶

Related Claims¶

• When light is well distributed and diffuse with no extremes of surface brightness, the eye is practically independent of illumination intensity within ordinary lighting ranges — related
• Indirect systems and semi-indirect systems with high-density reflectors produced the best results for sustaining clear seeing among the artificial lighting systems tested — possibly the same claim (merge candidate)
• Extremes of surface brightness in the field of vision are the most important causes of eye discomfort and loss of efficiency in contemporary lighting systems — a broader claim this one bears on