LEDs – Supplementary lighting and conspicuit
June 8, 2006
source from: http://en.wikipedia.org/wiki/Bicycle_lighting#Reflective_and_high-visibility_materials
Headtorches
Headtorches are a useful adjunct to bicycle lights. They can be pointed without steering the bike, giving useful "fill-in" lighting especially on poor or very dark roads. They also allow the wearer to read road and directional signs placed on high signposts.
Some rechargeable systems offer a head torch option powered from the main battery pack.
Reflective and high-visibility materials
Retro-reflective materials, in the form of reflectors, reflective tape, and reflective clothing, are useful in making a cyclist visible to other road users. Reflective materials can be applied to bike, rider, luggage, and tyres are available with reflective sidewalls.
On the bike
Reflectors and reflective tape provide additional visibility (especially when applied to moving parts of the bicycle) and are mandatory in many jurisdictions. Pedal reflectors in particular are very visible to following traffic as they move up and down; unfortunately they are not compatible with most clipless pedal systems, although adaptors are available for some.
Reflectives are visible only when in the beam of a headlight, and even then only within a narrow locus. Importantly, they do nothing to light up the road. Reflectors are not a substitute for lights.
Clothing
On dark roads reflective materials such as 3M's Scotchlite will show up boldly in car headlights. Evidence shows that bright material on the sleeves can prompt drivers to give more passing distance. Retroreflective materials can discourage some oncoming motorists from dipping their headlights, as the rider become less visible if they do.
The colour of lighting should be checked in the rider's area. A single solid colour can disappear under artificial light, particularly yellow sodium vapour lighting, and colour blindness is common; red/green colourblindness can make yellow fluorescent vanish against a green background (hedges or grass). Vests with both yellow and orange fluorescent plus wide strips of reflective may be the best solution.
In recent times electroluminescent clothing has become available to add to the existing array of LED-illuminated armbands and helmet blinkies. An electroluminescent helmet has been patented.
LEDs
June 8, 2006
Source from: http://en.wikipedia.org/wiki/Bicycle_lighting#LEDs_2
In many countries LED flashers are the norm for rear lights. In others such as Germany flashing lights are forbidden by law. In the UK flashing LEDs (front and rear) are legal from October 2005. It has been found that people tend to underestimate the distance to blinking lights and also that drunken drivers are attracted by them, and there is evidence that they are harder to place than a steady light; on the other hand they have also been shown to be between three and five times as visible as a steady light of equivalent brightness. Most LED lights will work in either flashing or steady modes; some have multiple banks of LEDs allowing both at once. The answer is to have one of each, or a light which will do both simultaneously.
The most common power source for rear LEDs is a set of alkaline cells; rechargeable cells are less environmentally damaging but have a much shorter run time. In both cases the battery tends to fail quickly when it goes; it is widely considered good practice to have two rear lights in case a battery fails en route.
