wquiles
Flashaholic
I am building a Direct Drive LE for an Aleph, using an UX1L 3W LED and using a single LiIon rechargeable cell. In order to know if I need to put a small resistor in series or not, I decided to do a full 24-hr burn in of the LED at 1000mA.
From the many LED's that I have tested, I decided to use LED # 3-14 (see full table here) , which had a fairly high vf during my initial testing at 3.90 @ 750mA.
Since my setup now has a massive fan cooled CPU heatsink designed to run CPE's in the 60-80 watt range, it does not even get warm with a punny 3W or 5W LED on it
Here is the basic setup:
here is the fan on the bottom of my light box cooling the copper heat sink:
I need a fan on top of the DB since it is running too hot:
Here is the initial vf and LBU (intensity) for LED 3-14:
Here is how the LED looks like while being tested, with the port open for the "warm" air to exit. When I want to take an LBU reading, I of course plug the hole
So here are the results:
- Time Zero:
vf = 4.09V
LBU = 425
- 9 hours and 46 minutes:
vf = 3.78V
LBU = 440
- 23 hours and 18 minutes:
vf = 3.75V
LBU = 443
- 26 hours and 19 minutes:
vf = 3.74V
LBU = 445
I took a contact-less temperature probe (the ones with the red laser) and measured 86F on the surface of the copper HS - room temp was about 79-80F. The highest reading I was able to take trying to aim the laser at the LED while it was still running was 92F.
Interesting data, isn't? :naughty:
Now that the LED should be "stable", I will test it with the actual LiIon cell and decide if I need a small resistor at all
Will
From the many LED's that I have tested, I decided to use LED # 3-14 (see full table here) , which had a fairly high vf during my initial testing at 3.90 @ 750mA.
Since my setup now has a massive fan cooled CPU heatsink designed to run CPE's in the 60-80 watt range, it does not even get warm with a punny 3W or 5W LED on it
Here is the basic setup:
here is the fan on the bottom of my light box cooling the copper heat sink:
I need a fan on top of the DB since it is running too hot:
Here is the initial vf and LBU (intensity) for LED 3-14:
Here is how the LED looks like while being tested, with the port open for the "warm" air to exit. When I want to take an LBU reading, I of course plug the hole
So here are the results:
- Time Zero:
vf = 4.09V
LBU = 425
- 9 hours and 46 minutes:
vf = 3.78V
LBU = 440
- 23 hours and 18 minutes:
vf = 3.75V
LBU = 443
- 26 hours and 19 minutes:
vf = 3.74V
LBU = 445
I took a contact-less temperature probe (the ones with the red laser) and measured 86F on the surface of the copper HS - room temp was about 79-80F. The highest reading I was able to take trying to aim the laser at the LED while it was still running was 92F.
Interesting data, isn't? :naughty:
Now that the LED should be "stable", I will test it with the actual LiIon cell and decide if I need a small resistor at all
Will
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