Tear Down of the 2AA Defiant light - Question about driver

2 lifepo4s and mtg2 direct drive J)

I just picked up a pack of these for my son to play with and they start on high after 3-4 seconds off from any mode.-Rick

Emitter is either XB-D or XT-E. XT-E being the more efficient of the two.
My HD 3aaa’s came with XB-D’s in them, very imperssive little emitters for being SO CHEAP.

HD also has some home lights that have “X” leds in them for like 12 bucks with tons of them in there! Thought about buying one to use for a little the rip it apart and make a new contraption. :bigsmile:

EDIT: looked at the 60w and there are 20leds in it!

Sorry you confused me there with your response but it was me. When I said plastic lens I meant reflector. Better get that whip out again. Ouch.

Just bought a pack of these and my wife, who has no interest in flashlights so therefore my obsession is dumb and a waste of money, actually is thrilled with the one I gave her. She keeps shining it around the room and cant decide whether to put it on her nightstand or in her car. I finally scored a few points for the light hobby.

LOL get her a zoomie! Pick up a sipik sk68 or a clone and she will love it.

Damn

The truest definition of love for your wife ...

"here honey I got you a crap light ... enjoy !"

Interesting information Would you please provide a link to this light you speak of?

LOLOL

Anybody want to hazard a guess about the driver?

d1

I wonder if the high and low are controlled by the resistors and if I could figure out which one is in the high circuit, I might remove it for a brighter high, with a Nichia 219 or XM-L. From the photo, anyone got any ideas??

Looks like those two 1R5 resistors are the sense resistors. They look to be wired in parallel, but can’t tell for sure. Probably does PWM for low mode.

How do I find out for sure. Is there a way to test?

You probably don’t have a meter good enough reliably to check low resistance values, so look at the pads on those resistors with a magnifier. If you can see that they are connected together at each end, then the resistors are in parallel.

Or you can try metering across the resistors. Short the probes together to get your zero-resistance value. The measure across the resistors and subtract that value. something around 0.8 ohms means they are paralleled.

I picked up a two-pack last night for $9.88…they threw them in the wrong bin! Very impressive lights for $5!! What would happen if it was dedomed? More throw, warmer tint?

They had these marked down to $7.98 at my HD.

Even better! Very impressive for a $4 light!!

I’d guess the resistors are in parallel, and the medium mode is done via PWM. While in Medium mode, wave something shiny like a screwdriver tip in front of the light. If the motion appears smooth, it’s not PWM. If you see 20 screwdriver tips all at the same time, it’s PWM.

Or you’ve been drinking too many screwdrivers… :party:

Precisely, and I recommend not waving screwdrivers around while drinking screwdrivers. Someone could lose an eye… plus you’ll look really stupid in the flashlight aisle at HD. :smiley:

Meh… you got two…