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Last time I looked into it the efficiency hold up for compact high intensity LEDs like we use today was due to quantum physics level stuff.
It looks like the ability to turn electricity into light in that manor was approaching the physical limit making LEDs the way we do now with a few small high intensity chips.
The biggest gains in efficiency would likely be from not making them out of dirt cheap inefficient power supplies that bring 120v AC down to much lower voltage DC as cheaply as possible.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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