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Old 09-29-2007, 05:24 PM #1
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Default 125mW green laser + brightest LED light on 2xAAA

I always loved to have the best technologies in the minimum space in my pockets, always with me, for fun and for usefulness, so I'ld like to add an high-powered LED flashlight head/emitter on the other side of my laser pointer, soldering it on the back-cap of the laser (the cover of the batteries) and sharing the same batteries and the metal case of the laser, that will so become a little two heads monster

My goal is to have short term brute force, i.e. the maximum LED brightness for some minutes, no matter the run-time nor if I can't leave it turned on for more than some minutes because of the heat problems, nor if I burn the LED once in a while.

My idea is to direct drive the LED with the lithium (or Li-ion? I saw that there AAA 3.7V Li-ion batteries on the market) batteries and to renounce to reflector and lens to save space and to conserve all the brightness. If the emission angle of the LED alone is <180 it's sufficient for me. Focus is not important for me.

I just researched on the web what's the current state-of-the-art of the micro-LEDs on the market and I came to the conclusion that the most powerful micro-LEDs on the market are these three:

Cree XLamp 7090 XR-E Cool White - performance group: Q5 (probable product code: 00XREWHT-L1-WG-Q5-0-01)
external diameter of the reflector: 6.80mm
minimum luminous flux: 107lm @350mA
drive currents: 350 to 1000mA
forward Voltage @1000mA: 3.7V
manufacturer note: tolerance of +/- 7% on flux and power measurements
forward current @3.6V: 750~900mA
relative intensity @750~900mA: 180~215% (100% = intensity @350mA)
Conclusion: minimum luminous flux @3.6V: 193~230lm

Philips Lumiled LUXEON Rebel Cool White - performance group: part number LXML-PWC1-0100
external diameter of the reflector: 3.17mm
minimum luminous flux: 100lm @350mA - 180lm @700mA
drive currents: 350 to 1000mA
forward Voltage @350mA: min 2.55V - typ 3.15V - max 3.99V
manufacturer note: tolerance of +/- 6.5% on flux and power measurements
forward current @3.6V: extimated (because out of graph!) 1400~1600mA
relative intensity @1400~1600mA: extimated (because out of graph!) 235~255% (100% = intensity @350mA)
Conclusion: minimum luminous flux @3.6V: 235~255lm

Seoul Semiconductors Co. (SSC) Z-Power (P4 series) (Pure White) - performance group: part number W42180-U
external diameter of the reflector: 7.40mm
minimum luminous flux: 91lm @350mA (240lm @1000mA?)
drive currents: 350 to 1000mA
forward Voltage @350mA: min 2.9V - typ 3.25V - max 3.8V
forward Voltage @700mA: typ 3.40V
manufacturer note: tolerance of +/- 10% on flux and power measurements
forward current @3.6V: 670~690mA
relative intensity @670~690mA: 165~175% (100% = intensity @350mA)
Conclusion: minimum luminous flux @3.6V: 150~159lm


My main concerns are:
- if the metal case of the pointer will suffice to have the some minutes of LED brute force
- what batteries can give the most brightness to the LED (while working alternatively for the laser) below their explosion point

What do you think about all of this?


PS: I just bought 2x Cree XR-E + 2x Luxeon Rebel + 2x SCC P4 on star/PCB and a computerized multimeter to learn their behaviour


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Old 09-29-2007, 07:42 PM #2
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Default Re: 125mW green laser + brightest LED light on 2xA

Sounds cool man. If you do this project, post some pics.
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Old 09-29-2007, 11:09 PM #3
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Default Re: 125mW green laser + brightest LED light on 2xA

http://www.luxeonstar.com/sub_catego...;link_str=1430

Try these - they're pretty durable and tolerant to a learning curve...
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