Hi Miguel,
First, try a fresh set of batteries to see if you get 3 levels. If not please continue . . .
Since you have pre- 2010 GDuP please follow the original instructions on the page 1
A brief description of how the On state UI works. (Auto-calibration UI update at the bottom of this post) - - Here it is is:
Turning on the light on and then quickly off will cycle the light to the next level when it is turned on the next time. We will call this "tapping".
Tapping the light will cycle to the next level the next time it is turned on. Internally a counter is incremented. If the internal counter reaches 15 the next time the light is turned on it will calibrate the light.
The internal counter is retained even when the light is off. There are two ways to reset the counter.
1) Turn the light on for more than a second.
2) Calibrate the light.
CAUTION: It would at first appear that you would rarely get the internal counter to numbers higher than 10. But, a casual user can easily get over 10.
One way is to play with the light. Cycle it three times, grin with happiness the light works as stated. Set the light down. Now the internal counter is at three and has not been reset. Later that day you pick the light up and do it again. Happily the light works and you again grin with happiness and fiddle with the light off. Moments later you repeat this process. Each time you cycle three times the counter continues to increment. Eventually the light appears broken and starts flashing and no longer cycles. Leaving the light on for more than second doesn't seem to do anything.
You have now started the calibration sequence with the internal counter having a value of 15 or more.
Once you get into calibration you can do one of two things:
1) Let it calibrate. (takes a few minutes) Successful completion is with the light ramping up/down 5 times and then going into low.
2) after turning it on turn it off after it stops ramping up/down.
The light ramps up/down at the beginning of calibration and the end of calibration. The internal counter is reset right after the first set of ramp up/down and can be turned off without affecting the current calibrated levels.
A fresh battery is recommended if you want to perform calibration and there is no harm to run calibration. Calibration is done when the light or LE is assembled and there should never be a need for re-calibration.
The initial ramp up/down in brightness may appear as a blink or may to others be termed or phrased differently. If you look closely the light intensity varies. This is the ramp up/down and it should do this 5 times.
Wayne