离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 2(41)

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Also, with floodlights positioned in a raised position (0.05D above the helideck surface) at the origin of the Limited Obstacle Sector and aimed toward the centre of the SLA, overall performance can be significantly improved. Data presented to CAA suggests that XENON floodlights now available for use on offshore helidecks may, in some cases (e.g. low cultural lighting), offer enhanced performance over the current generation of halogen systems. Trials have indicated that deck level xenon systems may have an application on NUI’s, when to use elevated halogen floodlighting would create an obstacle in an otherwise obstacle free environment.  Duty holders who select xenon systems must be particularly careful to ensure that lights are properly aligned and adequately shielded to prevent glare to pilots. Therefore, designers should note that the current floodlighting requirements might change in the future.
Such a change will not eliminate the need for general helideck floodlighting for the purposes of safe personnel movements around the helideck during on-deck operations.
11.3.5.2 Equipment Specification & Layout
The floodlighting systems should be designed and positioned to ensure adequate illumination without affecting pilots’ night vision.
The spectrum of the surface lighting should be such that the colours used for the markings on the helideck can be interpreted correctly.  The average light intensity on the landing area should be at least 10 lux. The maximum ratio between the average horizontal and minimum light intensity should be 8:1.

(Photograph courtesy of Orga BV)
Helideck floodlighting suppliers should be requested to verify the required lighting levels from the layout specified and using the luminaires types supplied.
Great care should be exercised in selection of the type of luminaire to be used.  It should be noted that, generally, halogen systems would have the advantage of ‘instant’ light whereas sodium type systems require time to ‘warm-up’ before they reach full output. The use of sodium lighting in this application may be problematical where the electrical system design does not make proper provision for loss of electrical supply (e.g. during changeover from main to emergency supply), however short-lived.
Manufacturers of floodlighting should be asked to provide a methodology for initial setting up (the angle between fitting brackets and deck surface is critical) and subsequent regular checking once installed.  Incorrect settings may dazzle the pilot or cause a ‘black hole’ effect.
For small installations, (e.g. satellite installations, etc.) particular attention should be paid to the floodlighting of the structure below helideck level with downward facing floodlights. This enhances the 'visual cues' available to pilots during night approaches to give depth perception.
On vessels with forward mounted helidecks, difficulties may be experienced with exposed helideck fittings (such as floodlighting) being damaged or swept away by waves, when the vessel is underway in heavy seas.
　
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