A summary of some researches on flashing light signals

Kishto, B.N.

doi:10.1177/14771535690010020201

Cited by 1 publication

(2 citation statements)

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“…This finding is consistent with previously published studies on the conspicuity of flashing lights. [1][2][3][4][5][6][7] It also suggests that neither the Blondel-Rey-Douglas formulation 38,39 for effective intensity nor the one described by equation (2) 42 are very predictive of the attention-getting characteristics of flashing lights.…”

Section: Differences Among Response Types In Experimentsmentioning

confidence: 99%

“…Flashing lights are used in aviation signal lighting because they are thought to produce higher conspicuity than steady-burning signal lights, and a substantial body of experimental evidence confirms this expectation. [1][2][3][4][5][6][7] Some authors have reported that very short pulses of light can appear brighter than a steady light having an intensity the same as the maximum of the light pulse, 8 the so-called Broca-Sulzer effect. 5 Despite their generally higher conspicuity than steady-burning lights, flashing lights can result in difficulty maintaining fixation and in judging the relative location or direction of the flashing signal [9][10][11] or can create distractions.…”

Section: Introductionmentioning

confidence: 99%

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Characterising the effective intensity of multiple-pulse flashing signal lights

Bullough

Skinner

Taranta

2012

Lighting Research & Technology

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Flashing lights used in aviation signal applications can be characterised by the luminous intensity of a steady-burning signal light with the same visual effectiveness. Different formulae exist for calculating the effective intensity of flashing signal lights that use multiple brief pulses of light within each flash. The results of a laboratory study conducted to test these calculation methods revealed that a formulation based on the Blondel-Rey-Douglas effective intensity method was more predictive of judgments of overall visibility than a different formulation published in recent aviation authority guidance. A follow-up experiment yielded confirmation of these findings. Different aspects of visibility resulted in very different judgments, and the limitations of the effective intensity concept to characterise the visibility of a flashing light are also discussed.

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