Some psychophysical tests of the conspicuities of emergency vehicle warning lights, Issue 36; Issue 480
Gerald Leonard Howett, Law Enforcement Standards Laboratory, National Institute of Law Enforcement and Criminal Justice
The Bureau : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1979 - Medical - 20 pages
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adjustable light adjustable reference light Average Reverse Rank beam blue filter transmits brighter bulbs Bureau of Standards center position conspicuity of light conspicuity rank Conspicuity Unit conspicuous than light control box Criminal Justice cross daylight daytime duty cycle effective intensity emergency vehicle warning Enforcement and Criminal Enforcement Standards Laboratory equal conspicuity fading fixation point fixed light flash-disappearance angle flashing light incandescent lamp incandescent light Law Enforcement Standards LESL light G light source light unit look main experiment night OHMMETER Perceptual Measure periphery physical measurements procedure Purkinje shift push the handle quantitative rank-score average reverse release the handle reliability retina roof running the intensity scale of conspicuity Scatter diagram showing sector disk showing the correlation side six observers stabilized power supply strobe strobe light Technology National Bureau tell the experimenter test light transmittance unit 18 variable resistor vehicle warning lights visual field voltmeter