Today I received my first LEDs to play with: a Cree XR-E, a Luxeon Rebel, a SSC Z-power P4, all pre-mounted on a star or PCB.
I immediately tested them directly connected to 2xAAA lithium Energizer batteries and I was disappointed by the results.
All were of similar brightness, the batteries went down from about 3.260V without load to 2.850V with the LED connected/turned on.
The currents were about 50-70mA the first time. Then, on a second measurement after a minute they were 40-60mA. Then, on a third measurement after a minute they were 30-50mA.
All the measurements last 1-3 seconds.
Why so low currents with direct connection to batteries? and why does them become even lower when tested after some time? please help me to understand...
I immediately tested them directly connected to 2xAAA lithium Energizer batteries and I was disappointed by the results.
All were of similar brightness, the batteries went down from about 3.260V without load to 2.850V with the LED connected/turned on.
The currents were about 50-70mA the first time. Then, on a second measurement after a minute they were 40-60mA. Then, on a third measurement after a minute they were 30-50mA.
All the measurements last 1-3 seconds.
Why so low currents with direct connection to batteries? and why does them become even lower when tested after some time? please help me to understand...