The critics mean, if everyone drives with light during the day, we survey the cyclists, because they only turn on their light, if it gets dark!
Ok, nice point. We bikers need bright enviroment-friendly light, too Hm, we all like LEDs! (You do, i´m sure ^^ ) LEDs on our bikes! Great idea!
So, I thought "Why, don´t build a LED-Bike-Day-Drive-Light?".
I started "developing" 6 months ago and realized that it is relative easy to do!
I wanted a light, that is bright enough to be seen on daylight.
In addition it should be possible to turn on both "light-systems" (the main-system: front-light, and rear-light, I hope you got them, but it is not necessary for this Instructable; and the new day-light-system)
And the most important point: it have to use the dynamo and NO BATTERIES.
Here on instructables.com are a lot of these battery lights, but if you ask me we all should never use batteries for a bike light! We have only the one planet... And we all should realize that good (longlasting) batteries aren´t cheap on long time. So, hey! A (Hub-) Dynamo is the best way if you ride your bike often. In my opinion good Bikers make their light in an environmentally friendly manner!
So, here are the advantages of the
... makes biking safer
... looks great, everyone is looking at you!
... you can turn on your ordinary light and the Day-Drive-Light
... LED-light makes fun!
Ok i wrote to much. LED´s start!
PS: please read the complete Instructable before you start. Some informations are necessary for the complete LED-Light :D
Step 1: What you need:
The Circuit is easy, so you don´t need a lot of parts. The main circuit is not my invention (but would be great ^^ ) if you are interested you can find the developer here (german page)
Soldering Iron and equipment
2x SCHOTTKY Diodes
2x Capacitors 2200µF/ 16V
(you can use caps from 16 V on, but it is better if they make more Volts)
Your HighPowerLEDs. I used "AVAGO MOONSTONE LEDs" partnumber is: ASMT-MW62-NFH00
- > Some information for your LED-selection:
Our Driving-Circuit drives the current of the Dynamo to (low-cost-) LED-friendly 300-320 mA.
If you want to build it like I did: You can use 4 0,5W LEDs (2x2 parallel and the two pairs in series)
But you can also use 1 W LEDs (if you do so, you have to connect each LED in series. A Dynamo is able to drive ca. 3 1W LEDs)
In Addition you need a Dynamo. A HUB-DYNAMO is perfect.
AND THAT IS ALL!
Sorry, if I don´t write how much it costs, because you can use desoldered material for the driver-circuit. The most expensive parts are the LEDs.