Emergency Vehicle Equipment 09
Emergency Vehicle Equipment 09 : Visual Warning Devices: (2) Active Visual Warnings: The warning lights may be of several types, which includes: (a) Incandescent - These are 'traditional' light bulbs, and may be found in the 'beacon' type lights, and will also be found where the vehicle's own lighting is used (such as wig-wag). Bulbs may be Halogen or Xenon type. They may use a rotating mirror to make them flash, or are simply turned on and off. (b) Strobe lights - These lights give a short flash, which has high brightness compared to an incandescent light. They are usually made to work in multiples (such as three rapid flashes consecutively) and are often used in patterns between sets, which increases their effectiveness. (c) LED lights - These are more recent developments, using the 'Super Bright' LED technology, and are entering wide use as they are easy to fit (being only a few millimetres wide, rather than several centimetres for most strobes and incandescent lights). This makes them particularly suitable for covert use. Though currently much more expensive than other types of lamps, there are substantial benefits. They draw much less electrical current than other types of lamps which is a valuable reduction in electrical load on these vehicles' over-stressed electrical systems. They are much more resistant to vibration and have much longer service lives. They also present very saturated colors and so enhance visibility during daylight hours
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