LED spotlights

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For the reasons I said. When you want a coloured light source which matches one of the available raw LED colours, then LED efficiency does help. This is because when you use a filamant lamp to create a red or green colour for example, you have to chuck away much of the light in a filter. With an LED, that's not the case. Also, LED's have an inherent reflector, which is significantly more efficient than any reflector you can build for a filamant lamp.
LED Brake lights have another advantage, that of much faster response. This might not seem significant, but actually it is if you work out the distance travelled in the delay whilst a filamant brake lamp comes on. There is a problem with them too; the wavelength used happens to be heavily filtered out by some sunglasses. A filamant lamp equivalent colour doesn't suffer from this as badly because it is composed from a broader spectrum, much of which isn't so heavily filtered.

Filamant lamps don't scale so small, but that's a different matter.
--
Andrew Gabriel

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Just as an aside, LED's have been used for boat navigation lights, where you would think they'd be ideal - it's really hard to change a bulb at the top of a mast - but in reality, they haven't become very popular. Nav lights have to be seen over a wide angle, so an array of LEDs pointing in different directions is necessary. They drop about 0.65V-0.8V, so they are run about 6 or 8 in series, with a resistor to drop the rest of the voltage, so the efficiency is fair, but when the total current for all LED's is worked out, it comes to more than that required for a bulb. It has to be said, though - they are a lot more reliable!
Mike.

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