it is hard to believe that airport lamps (not LED) were really connected in series.īut, this was and still is a common method of connection. The system does NOT cause all lights to extinguish when one (or more) bulb fails - see below for technical details. (Parallel lighting systems are also used). If one lamp would be bad, all lamps would be off and no distorted signal would be visible.Īirport lighting systems did and still do use series fed lighting systems. The purpose was to guarantee that all lamps would work together. Immune to blown bulbs and various other faults.Ī famous example of lamps connecting in series was at an airport, especially to indicate the landing strip. They are vastly more sophisticated systems than are used in eg Christmas Tree lights. Many airport lighting systems did and still do use series feed - but. The only answer I do not appreciate is lamps for the christmas tree, because these were virtually always defective because of the reason stated above.ĮVERYONE who is not aware of how series-fed constant current runway lighting systems work should read the excellent article cited by Kevin White. Does any one on this forum know about the application of lamps connected in series? I googled on this and could not get answers. With that knowledge, it is hard to believe that airport lamps (not led) were really connected in series. In parallel, one led with a v/i curve that is just slightly lower would be destroyed by the other leds. Leds must be connected in series and fed with a constant current. Today, with LED lamps, the situation is exactly opposite. Such lamps should be connected in parallel, or one lamp that would be just a little bit more worn out would get destroyed even faster because the series connection would result in a constant current supply, disastrous for lamps with a positive temperature coefficient, leading to thermal runaway. Now I know that it is bad to connect incandescant lamps in series. If one lamp would be bad, all lamps would be off and no distorted signal would be visible. A famous example of lamps connecting in series was at an airport, especially to indicate the landing strip. Long ago I learned about connecting things (e.g., lamps) in series and in parallel.
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