How to make a black light or ultra violet flashlight
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You can make your own ultraviolet flashlight!
Here is how it's done.
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 Click on picture if you would rather buy than make.         
UV_LED.jpg
First of course you need a ultraviolet source. Thanks to  a relatively new breakthrough in LED's, light emitting diodes, this is no longer the problem it used to be. Ultraviolet LED's are easy to obtain and they  use electricity  like a miser uses his money. If your local radio shack does not carry UV LED's you can order them  from HOSFELT ELECTRONICS, INC.  http://www.hosfelt.com/  You will also want to order some 1/4 watt 100 ohm resistors. Radio Shack should also carry these. you need one for each light you plan to make. I would make two or three lights. When I made my first one everyone I showed it to wanted one. Next you need to find a flashlight that uses either three or four  1.5  volt batteries.  Take the light bulb out of the flashlight, secure it by it's collar with a scissors clamp and heat the base of the bulb till the glass bulb can be removed by pulling on it. Be sure to use a clothe and extra care not to burn yourself.  Now heat the solder on the bottom of the base  with a soldering gun or iron. When the solder has melted and with the base still secured in the scissors clamp tap the shank of the scissors clamp sharply against  your work bench  so the meted solder is knocked off. Use eye protection! Another way to remove the solder is to use a solder wick which is available from Radio shack. Place the wick on the solder and heat it with a soldering gun or iron and the solder is wicked off. Now there should be a hole  through the bottom of the base. Set the bulb base aside for now and carefully solder the 100 ohm resistor to the + lead on the LED. First bend the short - lead to a 90 degree angle extending from the body of the LED. Now shorten the longer lead to where you can just get a pair of scissor clamps onto the lead up next to the body of the LED and leaving enough lead protruding beyond the clamp so the 10 ohm resistor can be soldered to it. Shorten the leads on the 100 ohm resistor to 1/4 to 1/2 inches. Solder the 10 ohm resistor  to the lead that originally was the longer or + lead from the LED using the clamp as a heat sink between the soldering gun and the diode or LED. Use a little flux and heat enough so the solder flows but not more than two seconds. Now insert the longer  lead into the top of the bulb base and down through the hole in the bottom. Position the LED as close to where the original bulb was so the light will be focused close to optimum. The free lead of the resistor should be at a 90 degree angle and it should drop into the slot on the side of the base where there is a blob of solder.  Hold the LED  centered and in position and bend the resistor lead down toward the bottom of the base and bend the long lead that is sticking out the bottom of the base 90 degrees. Now solder the minus lead to the the blob of solder on the side wall of the base using rosin flux. Clip off the excess lead. Now solder to the base of the bulb the lead extending from the base and cclip it off or clip off the excess! Bend the lead a couple of times so no part of it extends past the outside walls of the bulb base and flatten it down against the bottom of the base. This is you bottom contact with the flashlight. If you are using a three cell flashlight you are done. Just insert the new LED bulb into the reflector and reassemble the light and you have you UV flashlight. If you are using a four cell light one of the cells must go or the current will burn up your LED. I use a flashlight that uses four AA batteries and I cut off a piece of dowel that is the same diameter as the batteries and just barely shorter than the batteries.  Tightly wrap the dowel with tin foil, top sides and bottom. This is your dummy battery. Now remove one of the batteries and replace it with the dummy battery. Assemble the flashlight and presto! Portable UV light.


Check Resistor value after soldering this close. Finished UV LED bulb


100 ohm resistor is soldered to the longest or plus lead of  the LED
The center lead is soldered to the center solder joint at the base of the barrel and snipped off. The outside lead is shaped so that it lies along the solder on the side of the barrel and then it is soldered to this solder joint.






Some of my other pages
Science

Fishing


Quackery
Cartoons
By
Lynn Mills
Odds and Sods
And a little tongue in cheek

About Me
Black light UV LED
to convert a 3 or 4 cell flashlight
FishTackler®
Registered TM for sale! Click here for Info.
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What is Ultraviolet Light? Triple Blade Pop Style Fishing Spinners Cartoon 7
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How to Make an Ultraviolet Light FishTackler® Home Page Cartoon 8
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Outdoor Survival Tips that may save your life!
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