UFC 3-535-01
17 November 2005
Optimum aiming of lights depends on the design and output of the fixtures used in the
system. Light fixtures may be designed to cover several applications and may have
fixed patterns and aiming angles that differ from this document. Light aiming and
patterns other than those given in this document may be used if the resultant light
pattern produces equivalent light intensities in the areas required by this document. Use
bi-directional high intensity runway edge lights. The lights must be white, except that the
last 600 meters (2,000 feet) on an instrument runway must be yellow (caution zone
indication to the pilot) with minimum intensities of the main beams (Figure 4-2). They
may be capable of providing small amounts of omni-directional light to provide circling
guidance to the runway. The omni-directional component should be capable of being
shielded during times of emergency. The main beams must be toed-in 3.5 degrees and
elevated 4 degrees above the horizontal. Edge lights are operated at five intensity steps
as follows:
Intensity Step
Light Intensity Percentage
1
0.16
2
0.80
3
4.00
4
20.00
5
100.00
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