beam0. Your light is almost certainly programmable in all four modes. The problem you are likely having is that an AA alkaline can’t deliver enough power for the turbo mode, so they all look the same. I’ve seen the same thing with an Eneloop once it discharges a bit.
As brought to my attention by several people in the review thread the problem was the battery, the HI mode will not program with an alkaline cell, even a new one with 1.6v, it will go to HI but remains steady and doesn’t ramp.
With the 14500 I’m now able to program all 4 modes.
Today I received my UT01. Color NW.
First conclusions:
The color is much warmer. 3789K came out of my measurements. I would prefer closer to the declared value.
I am waiting for a battery of 14500, so the first tests with eneloop AA.
The amount of light from 1m is 2209 lux. Pretty good.
The switch is very unstable. Works, does not work, works again in a moment. Evidently the fault of the switch because I measured the circuits.
How bad is the parasitic drain on this light? I have it on order as a gift to my parents as a backup light and they will leave battery in the light for sure.
Ordered one of these 9 days ago at GB and our postal services mailed me that I will get it today. But the 14500 batteries are not here yet so can’t test it fully
Actually ordered 2, the second one was ordered couple days later.
FYI, that parasitic drain value is for a Li-Ion cell. My cheap DMM shows 0.0135 mA. I’m sure it will fluctuate a little depending on the cell’s charge state/voltage.
Both my UT01 lights are still working fine, without needing to do the tailcap mod; however, the tailcap springs dig into my NiMH cells pretty good, causing visible indentations on the back of the cell. I guess that’s better than crushing the driver on the other side.
I’ve started inserting cells from the top now so that I don’t have to touch the tail cap.