wquiles
Flashaholic
Since I have 30-40 D size Alkalines and not a single light in the house to use them, I posted some weeks ago interest in finding a small driver that would work from a 2D host using alkalines, to create a sort-of-emergency light for home use. I salvaged a 32x 5mm white LED "module" from a very cheap Chinese-made light, so I knew I had a project in my hands 
Based on the responces, I settled on the 2009 MicroPuck. I say "regulated" becuase it seems to be a constant voltage step-up circuit in there. It should work down to 0.8 volts, so with the 2D cells, it should run until the cells are "dry":
As you can see here, the module is actually smaller than the 2" reflector diameter, so it needs "something" to keep it in place. More on this later:
Here I tested the MicroPuck with 2D's and the "module":
and this was the vf and operating current:
It ocurred to me to simply try putting the module on top of the mag reflector to see if it closed up:
but I found out that the bezel would not close enough to clear the o-ring:
so I took some metal shears (and a knife to clean up the edges) and cut the outer edge of the OEM plastic reflector, which then allows the reflector to sit deeper on the head:
which then allows the bezel to clear the o-ring and almost close completely (good enough for me!):
so I continued with the typical LED mod steps to cut the bulb pedestal, solder wires, etc.:
And now I have a super long running, flood light for home emergency use which should run for a LONG time:
This is a shot at night just outside my car garage to show the beam characteristics:
For comparison indoors, on top we have a BOG 3W LED Module on an L5 bored out with a single 18650 LiIon cell, and on the bottom my 32x 5mm 2D light - notice the floody and great coverage from the new light. These are actually darker than in real life, so the sidespill from the new light is even more pronounced that what is shown here:
Will
Based on the responces, I settled on the 2009 MicroPuck. I say "regulated" becuase it seems to be a constant voltage step-up circuit in there. It should work down to 0.8 volts, so with the 2D cells, it should run until the cells are "dry":
As you can see here, the module is actually smaller than the 2" reflector diameter, so it needs "something" to keep it in place. More on this later:
Here I tested the MicroPuck with 2D's and the "module":
and this was the vf and operating current:
It ocurred to me to simply try putting the module on top of the mag reflector to see if it closed up:
but I found out that the bezel would not close enough to clear the o-ring:
so I took some metal shears (and a knife to clean up the edges) and cut the outer edge of the OEM plastic reflector, which then allows the reflector to sit deeper on the head:
which then allows the bezel to clear the o-ring and almost close completely (good enough for me!):
so I continued with the typical LED mod steps to cut the bulb pedestal, solder wires, etc.:
And now I have a super long running, flood light for home emergency use which should run for a LONG time:
This is a shot at night just outside my car garage to show the beam characteristics:
For comparison indoors, on top we have a BOG 3W LED Module on an L5 bored out with a single 18650 LiIon cell, and on the bottom my 32x 5mm 2D light - notice the floody and great coverage from the new light. These are actually darker than in real life, so the sidespill from the new light is even more pronounced that what is shown here:
Will
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