Visual Aids to Navigation with PWM Flicker Light

Modulation of fluorescent light: flicker rate and light source effects on visual performance and visual comfort

Viagra slows the visual response to flicker

As an undesirable side effect, sildenafil citrate (Viagra) partially inhibits the phosphodiesterase PDE6 [1], which plays an essential role in phototransduction (reviewed in [2,3]). PDE6 not only activates the visual transduction cascade, but also controls the time over which the visual response is integrated, thereby helping to maintain the size of the visual response within an optimal range a...

Visual discomfort and flicker.

Flickering lights can be uncomfortable to look at and can induce seizures in observers with photosensitive epilepsy. However, the temporal characteristics contributing to these effects are not fully known. In the spatial domain, one identified source of visual discomfort is when images have Fourier amplitude spectra that deviate from the natural (∼1/frequency, 1/f) statistical characteristics o...

Design Criteria, Applicability and Specifications of Visual Aids to Navigation Signs Used in Ports and Waterways (Case Study of Siraf Pars Service Port and Lavan Oil Terminal)

Due to the range of hazards threatening the navigation of vessels such as collisions with other passing vessels, collisions with structures such as breakwaters, and collisions with the bottom of vessels with the seabed, the design and use of fixed and floating signs should be considered. These signs, in addition to daytime operation, should also be equipped with portable lights to navigate duri...

Light Flicker Caused by Interharmonics

In certain circumstances, superimposed interharmonics in the supply voltage can lead to oscillating luminous flux and cause light flicker. This phenomenon can be observed with filament lamps as well as with fluorescent lamps. Different items are dealt with in this paper: § Presentation of some experimental results: determination of the sensitivity curves for different types of lighting devices,...