Picture of Simple LED Bike Lights
This is an easy way to add light to your bike, so when your riding at night you don't get smoked by a car(If this actually saves your life, take the time to tell me =D). Also putting LED's in anything is fun, so why not?
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Step 1: Materials

Picture of Materials
You'll need:

~Bike reflector
~LED, the brighter the better
~Battery pack with switch, or other smallish 3-3.6volt power supply
~Soldering stuff
~Drill with 3/16" bit. Use 3/16" for a 5mm LED

Step 2: Drill the Hole

Picture of Drill the Hole
Drill a hole in the reflector right where the clear and the black part of the reflector meet. Go slowly or else the plastic will crack.

Sorry the pictures are all blurry

Step 3: Insert the LED

Picture of Insert the LED
Take your LED and gently push it into the whole. If you used a 3/16" bit and a 5mm LED you'll have to push a bit.

Step 4: Soldering

Picture of Soldering
Now solder the anode and cathode to the wire, then solder the other ends of the wire to the positive and negative wires of the battery case/power supply. If it doesn't work make sure you got the longer wire from the LED to the positive wire of the battery case/power supply. Shrink tubing would be nice but Radio Shacks too expensive, so I used electrical tape which works just great.

Update 9/29/09:
I made this project a looonnngg time ago, so I didn't really think about adding a resistor. Now I would put a smallish value (51-100 ohms) resistor in series just to be safe, but you could probably skip one and be fine.

Step 5: Your done!

Picture of Your done!
Now stick the whole thing back on your bike, and go for a midnight ride! You can also add the back reflector by doing the same thing and connecting it in parallel with whatever power supply you used.
shreedhand1 month ago

yeah i used 5 mm 6 led on ma reflector..its just awesome...

ambrzdad5 years ago
awesome dude i made your setup for my wifes' bike and my bike too. i used a 3 led bulb flashlight purchased at my local dollar store $1 took the bulbs out of the flashlight (battery holder and switch) some soldering and wiring and ---we have bike lites for $1---actually $2 the 2d batteries good thinking---awesome idea
dpdonohue6 years ago
pretty cool idea ;)
JerryMopar6 years ago
GENIOUS man, Now I have a use for all those reflectors I have stuck in a box!!!
Booyah, made a pair!!! Only cost 3 bucks (for Radioshack "project box" 3 AA's are soldered togheter inside. Plenty bright!
geeklord (author)  JerryMopar6 years ago
Yours look a lot better that mine! I was gonna try and use lithium watch batteries or 1 watt LEDs
Yeah the RS :project box and the shrink tubing sure make it alot better looking. Those lithium-ion batteries can get quite expensive, yeah, LED dont use much power, but it will pull the cash right out of your pocket when it comes time to change them out. Why didnt you enter this in the Light your Ride Contest?? Wouldve been great!!
ya but with the lithium batteries you could do something like this to the reflectors on the wheels, that would be cool!
geeklord (author)  JerryMopar6 years ago
DANGIT! didn't see that one :(
geeklord (author)  JerryMopar6 years ago
Wait a minute....3 AA's?? Are all of them in series?
Yes, they are in series, put the LEDS are wired in parell. Works great!! I have found though, it would be wise to glue the LEDS inside the lens. The little leads off of them dont take fatigue well. My rear-lights lead broke off.
geeklord (author)  JerryMopar6 years ago
Your putting 4.5 volts into the LED's. LED's take 3.3-3.6 volts for white/blue and 2 volts for red and green. You should probably put a 68 ohm(blue gray black) resistor before the white LED and a 150 ohm (brown green brown) before the red LED.
Zem6 years ago
Very simple. Nice job.
When drilling into plastics,heat up the drill bit by drilling into some hardwood a few times.If the drill bit is hot enough , it will not crack plastics.gl ;-)
geeklord (author) 6 years ago
hey,I'm commenting on a iPod touch from the apple store in the mall of America!!!!!!!!
geeklord (author) 6 years ago
Yea, its my Dad's. But the same idea applies, he didn't go cheapo
randomray6 years ago
Great way to let people see you , don't forget a headlight you need to see where you are going . Nice
randomray6 years ago
Nice drill , didn't go cheap there .
Kaiven6 years ago
I never ride at night, and realized i cant use lights on my bike xD guess ill have to finid a basket mod
i love riding at night :-D
Dr. Cool6 years ago
I was actually going to do something similar like this to my bike, thanks for posting this! Doc Cool
geeklord (author)  Dr. Cool6 years ago
Man you are awesome posting a comment on the same day I posted the instructable! and yourwelcome for posting this :D
Haha, No problemo, keep up the great work! Doc Cool