= Bike Lamp Take One =

Before starting the [wiki:projectBikeLamp CriticalLux] project, I tested out the [http://lumileds.com/ Luxeon III] high power LEDs on a simpler design based on this [http://www.instructables.com/id/Ultimate-Night-Vision-Headlamp---500%2b-lumens-with-/ article]. The driver, taken from [http://www.instructables.com/id/E7QH8NG8I1EWOF32HJ/ here] was fixed and linear. Cyan LEDs where chosen as this colour is better perceived at night by the human eye than any other. There wasn't much of an enclosure. The LEDs were glued directly to an old CPU heat sink and the circuit was soldered "[http://en.wikipedia.org/wiki/Point-to-point_construction dead bug]" style. The efficiency of this design was very poor and the cyan LEDs freaked out cars more than anything. And so [wiki:projectBikeLamp version 2] was born. You can see a few pictures of this build below.

== Bibliography ==
 * [http://www.instructables.com/id/Circuits-for-using-High-Power-LED_s/ Circuits for using High Power LED's]
 * [http://www.instructables.com/id/Ultimate-Night-Vision-Headlamp---500%2b-lumens-with-/ High Power LEDs Night Vision Headlamp]
 * Data on [http://hyperphysics.phy-astr.gsu.edu/hbase/vision/bright.html Perceived Brightness]

{{{
#!html
<div style="text-align: center;margin-top: 50px">
    <b>The Light</b><br />
    <a href="http://flickr.com/photos/xsmurf/993688916/"><img src="http://farm2.static.flickr.com/1009/993688916_fbc2a5cf8d.jpg?v=0" alt="Luxeon III on CPU heat sink" /></a><br /><br />
    <b>Lights on</b><br />
    <a href="http://flickr.com/photos/xsmurf/992836453/"><img src="http://farm2.static.flickr.com/1360/992836453_371da040e8.jpg?v=0" alt="Cyan Luxeon III" /></a><br /><br />
</div>
}}}