UV/IR/Visible LED Flashlight with Intensity Control


Posted on Feb 7, 2014

Build a 10W LED flashlight that features swappable UV/IR/visible heads. We decided to document the build since this flashlight would fit nicely in a photographer`s kit for light painting, IR illumination, UV reflected photography, or UV fluorescence photography. Our flashlight is based on LedEngin`sLZ4-40_ series 10W LEDs. These are available in wavelengths ranging


UV/IR/Visible LED Flashlight with Intensity Control
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from theinfrared through the ultraviolet. White-light LEDs of different color temperatures are also available as part of this series. WARNING! This flashlight is capable of producing very powerful invisible radiation in the UV and IR. The eye`s protection reflexes do not work at these wavelengths, and may thus cause extensive damage if exposed to direct or specularillumination. In addition, UV at 365nm may cause damage to the skin. Never point this flashlight at anyone without taking proper precautions! The flashlight is powered from 4 9Vlithium batteries or from an external 14 to 30VDCpower supply (12VDC also works, but may not achieve full power output). Start by constructing the flashlight`s body from an 8 ³-long piece of standard-wall aluminum or PVC 2  pipe-size (2 3/8  OD) tube. Drill a 3/8  hole 1. 5 ³ from one end for the pot, an a 5/32 ³ hole for switch another 1. 5 ³ away. We also drilled and tapped a 1/4 ³-20 hole on the bottom so that the flashlight could be mounted on a standard tripod. Start to assemble the electronics by soldering the size M coaxial power jack to the LED output of the LuxDrivemodel A011-D-V-700700mAFlexBlock Constant Current Driver. Use a piece of heat shrink tubing to insulate the center connector to prevent shorting. Next, solder the 20 kOhmlinear pot to the LuxDrivemodel A011-D-V-700700mAFlexBlock Constant Current Driver. Notice the connections such that the turning the pot clockwise...




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