This project will run you at about $50 not including batteries. There are other cheaper DIY alternatives and production flashlights that may give you the better deal (dollars to lumens), but if you love flashlights and DIY, then this project is right for you.
This modification can be done by a "beginner" with limited flashlight knowledge, soldering skills and a basic idea on how to utilize limited resources.
Other Helpful Links (how I learned to build this):
Candle Power Forums
Budget Light Forums
Step 1: Parts & Tools
- Maglite 2D (local hardware store)
-3/4 inch diameter pvc coupling (local hardware store)
-3/4"x1/2" Reducer Coupling Copper (local hardware store)
-LED-Cree XM-L (Bin T6 or U2- I used U2)
-Arctic Silver Thermal Adhesive or similar item
-Wire Stranded 22 AWG
-O ring 50mm
-small spring (salvage off of old/cheap flashlights)
-insulation foam (2"x2")
-18650 Batteries - Panasonic or any reputable brand will work. Do not purchase ultrafire 18650 batteries despite their price. There are too many fakes out there and the quality of them is terrible. You can also avoid purchasing the Recharagable CR123A's shown in the pictures. [10/12/2013 UPDATE]
-Thick Small Diameter Rubber band
-Hot Glue Gun
-Wire Cutter & Stripper
-Torex T-8 screwdriver
-Pipe Cutter 1/8"-1-1/8"
-2x Small Staples
You Might Need:
Make sure you check all parts before and during assembly to make sure everything works.
Step 2: Battery Tube Modification
To do this, you take the 3/4" PVC coupling and wrap it in electrical tape until it fits the diameter of the flashlight chamber. Insert it in to check the fit, then take it out. (cut a rubber band and wrap it around the pipe to save some tape)
Next, you must replace the spring, as the tail spring is too big to make contact with the small batteries. Take out the spring and the replacement bulb. Then, take the insulation foam and cut it so it will fit flush inside the tail cap. Take a piece of wire and make sure it makes contact with the metal in the tail cap and solder it in place. Place the already cut insulation foam inside the tail cap, making sure the wire sticks out. Solder the wire to the tail cap and make sure the wire stays in place on the foam. The tail cap modification is complete. (**DO NOT TURN ON THE LIGHT- once the tail mod and new batteries are inserted, you will burn out the incandescent bulb if you turn it on)- but then again, it is basically trash now. The spring can be kept for future projects.
Step 3: Taking Out the Switch and Preparing the Switch
**I was not able to grind down the shaft enough, so I destroyed the switch assembly. **
In case the same happens to you, take a drill and drill down into the whole until you see the torex screw. Then insert the torex wrench and take out the screw. Throw out the destroyed parts, only leaving the black cylinder.
For more information, google how to take out maglite switches.
Once you have isolated the black cylinder (housing of the switch assembly), take out the assembly on the top of the switch and cut off the tower part that sticks out. Proceed to sand the surface of the switch assembly until it is flat.
Step 4: Heat Sink and Copper Pipe Fitting
The copper reducer coupling is also acting as a heat sink in this project. You must cut it to the right size to have the correct focal distance between the lens and the LED. First, take the caliper and measure out .45" from the bottom and mark it with the sharpie. Proceed to cut that portion off with the pipe cutter. This may take some time, as it is very tedious. Use a clamp and some tape to make the job easier. (use youtube if you are not sure how to use the pipe cutter) Proceed to next paragraph.
The copper now needs to be tapped. (drilled): First, mark .30" from the top and make an indention with a steel punch. Move .25" over and repeat. Next measure .30" from the bottom and mark it with the steel punch (only if you messed up the switch assembly). You should now have 3 indentations in the copper. Cover the copper in masking tape except in the indented areas. (in case the bit slips)Clamp down the copper and use a 1/8" drill bit to drill through the copper. Make sure to drill at a very low speed.
Step 5: Heat Sinking LED and Driver
Attach the LED to the Aluminium Heatsink using the Arctic Silver thermal adhesive (following the instructions in the attached link)
Next step is to prepare the driver and heat sink the driver. Test fit the driver in the copper heat sink with the wire side up(output wires). Test to see if the two wires will go through the two holes on the top. If it is good, then solder the input wires to the driver. See attached images. Once this step is complete, test fit the driver again inside the copper heat sink. Then, apply rubbing alcohol to the Q-tip and clean the inside of the copper. Mix the thermal adhesive as the website's instructions tell you to do so, and apply it liberally inside the copper heatsink. Excessive in this case, is okay. Insert the driver inside with the output wires sticking through the two top holes. Make sure there are no gaps between the driver's sides and the copper. Hold in place until it sticks by itself. Then, solder red and black wires to the output wires. (use heat-shrink tubing to cover up the solder) (about 3 inches of wire- red and black)
Place the LED Heats sink on top of the copper one and strip the output wires to the desired length. It may help to only leave 3 strands of wire.
Step 6: Preparing the Switch
If you had to drill out the original switch, then connect the manafront switch to the tabs. First, solder a black wire to the spring and then another one to the outer golden ring. Then, connect the spring wire to the driver's negative input wire. and then take the other black wire and slip it through the bottom hole in the copper. (this is the ground) Then, solder the red wire to the silver tab from the battery terminal (positive). Heat shrink everything to ensure no short circuits.
Next, superglue the copper heat sink to the black switch assembly. After that, insert the whole switch assembly through the back of the flashlight tube.
If you had switch problems, read this paragraph. Before you insert everything into the flashlight tube, sand some of the anodized area inside the flashlight tube, near the opening. After doing so, solder a black wire to the part you just sanded and connect the black wire from the bottom hole to the wire that you just soldered. It is now a complete circuit.
Step 7: LED and Lens
To mount the aspherical Lens, take out the original reflect and the plastic lens. Insert rubber O-ring on the top of the aspherical lens and place them inside the reflector body and tighten up the crown. Then, twist back onto flashlight.
You should have tested all the parts to make sure they work before hand and also test things before you glue them permanently. With that said, now you are done with the project Insert the batteries and point the light away from your face and unleash the beast.
Step 8: Pictures and Comparisons
Post Questions in the comments if you have any.
If you do this project, post your photo's in the comments! Good Luck!