This is a LED strobe based on PIC12F629. Microcontoller sends control pulses to the LED and make it flash. The ouput transistor is delivering 100mA to the LED at each pulse. There is also four jumpers providing options for changing the pulse width, strobe repeat interval and single or double strobe flash. PCB, schematic and source code is available on the link..
LED Strobe using PIC12F629 - [Link]
I have been using an eye loupe for viewing small electronic components, inspecting PCBs etc. However I was intrigued the other day when I saw this illuminated LED eye loupe at Sparkfun and I thought I should make my own. The instructable shows how to adapt an ordinary eye loupe to an illuminated LED eye loupe. [via]
How To Make an Illuminated LED Eye Loupe - [Link]
Cree Inc a leader in LED lighting industry announces the commercial availability of high power leds rated at 208 lumens per watt running on 350mA current. That’s one of the most powerfull leds available today with many applications in a wide variety of fields and an efficacy record for leds. The led future seems bright!
White power led at 200 lumen/watt - [Link]
The exponential growth of LED lighting has ushered in a vast selection of integrated circuit devices to provide controlled power to LEDs. This article describes some basic LED theory and several techniques used to provide dimming control to switched-mode LED drivers. Read more on the link below
Dimming Techniques for Switched-Mode LED drivers - [Link]
Building a high-power LED light with adjustable color temperature.
The goal of this project is to develop an energy efficient lighting system that not only produces light, but that produces light with a color and spectrum that actually has a positive influence one one’s biological and mental state. Just like sunlight.
Color temp tunable lamp prototype - [Link]
Lux Spectralis is a deluxe RGB (red, green and blue) LED (light emitting diode) blinky that you can build. A small microcontroller (Atmel AVR ATtiny13) is preprogrammed with many different display modes that you can select with a pushbutton.
Deluxe RBG LED Blinky - [Link]
Jimmie P Rodgers . com writes:
The Open Heart is an LED matrix of individually addressable LEDs. It can be used to create a brooch or bag light with highly customizable animations. It can be configured so that you can temporarily attach it to fabrics with headers that you simply push through, or you can configure it to be sewn into a project using conductive fabric for a more permanent setup. [via]
Open Heart - [Link]
So there are a ton of instructables covering the use of high brightness leds. Many of them use the commercially available Buckpuck from Luxdrive. Many of them also use linear regulation circuits that top out at 350 mA because they are highly inefficient. This instructable serves to let people know that there are other options out there to drive high power leds.
1.5A Constant Current Linear Regulator for LEDs - [Link]
João Silva writes:
Some time ago I had the idea of building a LED lamp that was solar powered, harvesting the Sun during the day and charging the battery, while at night deliver some light. The idea was to extend the hours of light of my peppers during the winter, once the vase was inside the house. [via]
LED SolarLight - [Link]
A small ATMEL ATtiny13A microcontroller (IC1) is the brain of the circuit. One pin (PWM) blinks the lights, most of the other pins are used for programming and power. You could get similar effects with a 555 timer or discrete components, but our goal is to learn about a new microcontroller family and make something easy to hack. [via]
Hackable LED Christmas card - [Link]