Ummm YEAH IT WORKS! (high beam) but only when the light is"off" 
Prolly what you meant.
According to the specifications for that bulb, it should have two separate LED sections
(one for high beam and one for low beam):
Power=12w(high beam 6w, low beam 6w)
The low beam should be connected to the lighting switch and the high beam should be connected to the horn button.
I would have expected the High beam LED to have worked in addition to the low beam, as many bikes are equipped with a headlamp flash button which allows the headlamps to still be flashed even while they are on Low beam.
It sounds like that bulb can only run one beam at a time, but not both together.
Unlike the halogen bulbs they are meant to replace, Many 12V H4 LEDs have the Low beam come on with the main beam:
E.g. the High beam would be 12W
(6W High + 6W Low LEDs combined) but the Low beam is just 6W when it operates on its own.
In this case, the headlamp flash would light both High and Low LEDs if you flashed the lights without low beam being on already.
Unfortunately, many of the Chinese LED bulb manufacturers do not seem to understand the importance of the LED's operation, and some are even oblivious to the LED's critical positioning, as it should be located at the precise focal point of the headlamp's reflector like the filaments are in a conventional halogen bulb, or it will not produce the correctly focused beam pattern .
Is your headlamp brighter when using one switch compared to the other, and/or does the beam pattern actually change similar to the patterns shown on the above picture?
Alan
