led lighting for 6v vehicles

Posted on Feb 7, 2014

This design replaces the incandescent bulbs in the stop, tail and indicator lights of an MZ or other motorcycle with a six-volt electrical system,with high-intensity Lumiled LEDs. This gives the following advantages: A single Lumiled with a power consumption of around 1. 2W gives a light output equivalent to a colour-filtered 21W incandescent bulb. The load on the

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electrical system is therefore considerably reduced. The power saved may be used to drive a more powerful headlamp bulb. Unlike incandescent bulbs, LEDs do not burn out, and are not affected by vibration. Therefore, they do not need to be replaced. Accordingly, the light units may be permanently sealed and waterproofed with silicone sealant or similar, and connections to the LEDs made by soldered connections rather than contacts. The reliability of the lighting system is therefore much greater than the standard incandescent system. The colour of the light is determined by the properties of the semiconductor material from which the LEDs are made, and not by filtering with a coloured lens. Therefore, should the lens be damaged or broken in an accident, the lights will continue to show the correct colour. Unlike an incandescent bulb, an LED requires external circuitry to limit the current taken to a safe value. This is generally done with a simple series resistor. However, this approach is not suitable for a six-volt automotive electrical system. The LED will drop about 3 volts in operation, and the supply voltage may vary from about 5 volts to 7 volts or more depending on the state of charge of the battery and the engine speed. This would result in a variation of about 2:1 in the voltage across the series resistor, with a consequent 2:1 variation in the brightness of the LED. The current is nominally determined by the value...

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