Update exactly 7 months after initial post: I have used this on my night stand, for a little bit of instant light during the night. The thing is still working, but visibly dimmer, the batteries are just under 1V each, so mostly discharged. 7 months is a pretty good life time.
This does not deserve so much attention, but here it is. I got one of the Ikea Molgan motion sensor lights and thought it is too bright for the application. The light has 5 LEDs inside and the tipical BISS0001 pir IC.
They were bright enough to use a current limiting resistor for each LED(the right way to do it), so there are 2 solutions: increase the resistor for each LED, or just leave a single one ON. I took the lazy way out and cut the trace after the first resistor.
In case you are wondering, the original lamp burns almost 70µA while on standby and almost 100mA while the LEDs are on. This gives you about 1.6 years of standby and 10 hours of light or however you manage to combine it(about 6 months at 5 triggers of 30 seconds per day). With this change the light time is increased to 5X, so about 50 hours.
Too bad they used AAA batteries, AA would have been slightly larger, but with 2.5 times the life.