Hi. In 2006-2007 the SSC Seoul P4 U-bin was unleashed and it was spectacular boasting 100lm/watt. i see that now the Cree XP-G boast 148Lm/watt and I am sure that other manufactures have similar LED available BUT the form factor is a huge issue considering that you can't replace the old P4 with the new LEDS!!!!
Is there a P4 pout there that can be used to boost the light output?
can I use a P7 W-Bin they look allot bigger and I am not sure if old P4 lenses will fit the P7
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: LED P4 highest efficacy lm/W