Ok , I will look it over . Now I see where hi = bridging all 4 pads . Thanks
Anything with a µC would certainly have multimodes, unless reflashed.
The 7135, though, needs a certain minimum voltage to keep working, about 2.7V, so it’s not like DDing an LED and leaving it on in a closet or anything. It will cut out.
So it does have a form of LVP by default you are saying.I rather use this driver as it is cheap.
Not precise, as in sensing the input voltage and cutting out when it drops to X, but yeah, 7135s do cut out below a certain voltage.
If anyone’s interested in trying a batch, have at it. With, say, 3 chips, one might cut out at 2.73V, the next at 2.69V, the last at 2.65V. So it’s not one Master Circuit doing it, but it will crap out before killing the cell.
And when you see it getting dim, that’s Clue #1 to stop and recharge.
Dim happens over a period of time so might not be easy to judge . I have seen step downs that weren’t noticeable if down gradually .
I sent an email to UltraTac asking about their A1. They sent me back a coupon code to share for Amazon. Coupon price $11.99.
Here’s a link to the page: UltraTac A1 on Amazon
Here’s the coupon code: BLFA1OFF
My second favorite AA light. Thanks Sprinkles. Ordered two more.
Just ordered me another, thanks for sharing. :+1:
Thanks, ordered 3
No need to flash the driver I linked from Ali, the driver has a settable modes with the bridges. All four bridged one mode (high).
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The amc7135 in the datasheet list the working voltage as minium 2.7v, that doesn’t mean it wont work lower. It just means ADDtek specs all amc7135’s to work correctly at 2.7v. I have the exact driver you linked. I tested it with a DPS5015 and a XML, the light became dim at below 2.5v and kept getting dimer until 2.25v at that point the led was just barely glowing. At 2.5v just guessing, looked like maybe 5 to 10 lumens.
I don’t know where the amc7135 quits working but its definitely lower than 2.25v.
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Removing the diode and using a jumper supposed to gain a few millivolts back also, I tested mine with the diode on.
Rated pretty conservatively, then. 
The new Convoy driver with Biscotti firmware can be set for single-mode operation and has LVP at about 2.8V:
Or you can buy it as part of a ready-made light:
Either way, get the 4×7135 version and set it to single mode (mode group 12) for your family to use; you can always choose a different mode group in future if you want to.
I was looking at that driver. Too bad there isn’t a 50% setting in single mode.
Order the 4 chip version. This will be 50% on high of the 8 chip version.
4 chips = about 400 lumens or so?
With a warmer tint emitter, probably so.
With a cooler tint emitter, maybe a bit more.
The Thorfire TG06S is scheduled to be in a Lightening Deal on Amazon.com starting at 7:35 PM EDT, 12 Sep 18. A summary of its features is listed below.
| Manufacturer Model LED/Tint |
Output in lumins Runtime (hrs + min) |
Dimensions | Weight (grams) |
Reflect | Comments | ||||||||||||||||
| Length (mm) |
Diam (mm) |
||||||||||||||||||||
| Thorfire TG06S XP-G2 ~ 5500 K |
Steps down from High to Med after 3 min. |
96 | 20 | 37 | SMO | No mode memory. Always starts in High. Alum alloy body. IPX-8. O-ring behind the lens glows in the dark. No noticeable PWM (to me). |
This is the flashlight that I carry every day in a belt pouch, and use as an inspection light. I like it because it has no mode memory and always comes up in High.
EDIT: There was a 20% off coupon for this flashlight when I first saw this listing - now it is gone. The current price is $16.80. The price has to go down to around $10 for this to be a good deal IMHO. Last June I purchased one for $9.79 during a Lightening Deal that gave 20% off plus a 20% coupon.
Please note that if this flashlight is left off ≥ 3, sec then it comes up in High. Otherwise, if left off for < 3 sec, it comes on in the next mode. Therefore, if you click this flashlight On and Off rapidly, it will appear that it has Next Mode memory.
EDIT2: Deal price is $12.79 (24% off). FWIW, the Elfeland Outdoor Lighting Store on AliExpress is offering the Thorfire TG06S for $10.28 for a few more hours. Delivery time to the US is 12 - 20 days via ePacket shipping.
It’s basically just cycling through the modes (H>M>L>Moon), isn’t it?
Yes, you can cycle through the modes with either a half- or full-click.
H, M, L and ML
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Not my cup of tea. I will not buy anymore thorfire lights for this reason. I prefer ML, L, M and H.
I hate to be blinded upon first click of a EDC flashlight.