Good point on LED MR-16 may be larger & not fit
Thanks, I would not have thought of some LED MR-16s being larger due to the heat dissipating fins on the back of the bulb. The bulb you linked to is 2 watts but only 38 lumens, presumably because the light beam spreads widely. That makes it a good "be seen" light. The wattage is low enough that it apparently does not need a heat sink with fins in back.
Between the size and heat issue, I can see that LED MR-16s are not a simple "plug in" replacment. The light fixture must have enough space to the back and/or sides to accommodate the heatsink fins on the higher output LED MR-16 bulbs plus allow ventilation to dissipate the heat from the fins.
Time to look at measurements of the LED MR-16 versus the interior dimensions of the particular bicycle light. The same LEDwholesalers Inc ebay store also sells a 3 x 1 Watt 12V MR16 CREE 7090 XLamp LED WHITE 240 Lumen, beam width 38 deg, 6000 Kelvin. Link
. Dimensions are Diameter 1.96" or 50 mm, Length 1.9" or 48 mm. If this fits and gets sufficient ventillation, this could be the best candidate so far.
Last edited by Giro; 09-20-07 at 10:22 AM.