nice informative thread! im in this constant dilemma over whether or not to switch to LED's as headlamps or stay with the stock lighting on my motorcycle. The current light output is dismal with the AC. i was however able to get some more spread on the low beam by adjusting the headlight's reflector to point it at its lowest level but light doesnt seem enough...
i started playing with these led bulbs (on a smaller scale) - replaced the Parking/position/pilot lamps on my bike from the 5W stock to
1) 1.5W T10 5 * 5050 type LED bulb
and later to
2) 3W T10 6 * 5630 type led "projector" bulb.
"projector" because they had these small lens type thing at the end. (and yes these were bright!!)
1) cost me 30 rupees each(local shop) and 2) cost me ~ 80 rupees each (ebay)
I used the 1.5W leds for a week or so..nothing happend and then i replaced them with the 3W ones, and replaced the tail license plate light ( running on DC) with one of the 1.5W bulbs.
I was like
after the swap.. becos i did not do any wiring change.. just plug and ride..
2 days later one
of the LED's stopped working.
i took them both out and found that the plastic housing had a hole generated on one side (happened for both LEDs, but one of the led's was still working)
im confused how this happened...
Was it because :
1) the heat from the LED's melted the plastic directly?
if so, why was the plastic melted just at one location and not uniform?
i went a bit further and took out the plastic housing and found that the rectifier had become tandoori-rectifier
2) maybe, since AC current is being fed, and for half a cycle the LED's were not going to function during this time,
--> the resistor was being overloaded with the extra current (or voltage?.. pls correct me),
-------->and so the resistor burnt out first causing some plastic melt..
------------->, and then caused the led's to draw more current causing more heat leading to more plastic melt, till the led's themselves failed?
i'll post some pics of the bulbs a bit later, but just want to know if i do the coil rewinding and convert my bike to full DC and use the same set of pilot bulbs, will i run into the same problem?... was the problem with the nature of voltage input being AC? or the build quality of the bulbs with lack of proper heat sink?