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    Driving the P7

    This driver is specifically produced for the p7 as seen in the page here Seems like this maybe a good choice as a driver. AdditionallY , I have used LEDTech before and they are very reliable and sell quality stuff. Here's another driver that might just do it (10 watts)
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    Z-Power P7 Series - World’s Highest Brightness of 900 lm at 10-watt

    SSC P7 CSW0J 12W LED Star available from kaidomain here Also on a star $28.00 Anyone bought one? feedback??:duh2:
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    Brightest 5mm @ .5 watt 80 degrees

    Driven at max, they do need some sinking, but at 50-75ma they are just warm to touch and still with an enormous output. My only complaint is that the warm white is easily 6500k which is totally wrong IMHO. I told LED-TECH about this, but they said they were correctly binned. Thanks for the...
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    Brightest 5mm @ .5 watt 80 degrees

    Sorry if this is the wrong place to post, but Ive just taken delivery of some 5 mm .5 watt LEDs from http://www.led-tech.de/ . They are very powerful leds considering they are 5mm non SMDs. Rated as below. Also available in white. I've not seen these kind of specs elsewhere, but let me know...
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    Energy loss and efficiency

    Thanks Long John for a nice example of simple efficiency. I have been put off wiring too many LEDs and in your example, 11.8 volts will only supply 2.95 v Not enough forward voltage on a low battery? Anyway, Occam's razor suggests that the simplest solution is usually the best one., so I will...
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    Energy loss and efficiency

    Having experimented a lot with LEDs for home lighting, Ive concluded that often more energy is lost in stepping down voltage and current than actually lighting the LEDs. Both resistor and constant current circuits have to 'dissipate power' in order not to overdrive the LEDs. Worst case...
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    Getting parts for LED driver in UK

    Thanks for your replies, both very insightful and helpful. I wish this forum had a thank-you system :wave: Actually it does, but it's not installed. I'm building a light bar, so there are 20 matched, 100ma wide-angle LEDs in strings of 2 and paralled together running off a 12 volt supply...
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    Getting parts for LED driver in UK

    I want to build a driver circuit from Instructables But cant find a supplier of the Fairchild 2N5088BU or Fairchild FQP50N06L anywhere in the UK! Only datasheets come back from a Google search. Can anyone recommend an alternative that's available in UK or know a supplier. PS. purchasing from...
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    LED Voltage and current question

    Thanks for your replies:p. I was trying to establish a safe working principle here, before using the circuit for my array. The actual setup will be running about 10 LEDs in a series parallel combination. The series strings of 2 LEDs will require 2x3.4volts = 6.8v and these 5 strings will be in...
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    LED Voltage and current question

    According to the above circuit I need about 6 volts input to run a luxeon star LED. As I understand it, the regulator takes about 3v leaving 3v for the LED and the constant current regulator will will provide a fixed current of 320ma which is just fine. My question is, can I use a higher...

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