Was thinking about that too - multi-LED aspheric, or simply adding an aspheric in place of the glass for the mule lights Hank proposes. Not sure if there would be a gain or loss though for the extra cost.
And one thing that would be interesting with LES that is huge relatively to lens size - very strong Fresnel lenses. Would produce a notably narrower beam (IMHO much more useful) and short zoom travel would compromise cooling only slightly.
Where did you see that? The IOS page and posts here have me totally confused. I can only guess at what it all means since important facts are being left out.
For example, the IOS page for the D4S2 has only one # for the XPL HI, but he offers the XPL HI in V2 and V3, so they can't be the same??
Is the "L3" the 5000K or 6500K SST-20? I see on the spec sheet a 5000K LED is available in L2 or L3, and the 6500K available in L3 or L4.
One possible explanation is the SST-20's draw lower voltage, so for a higher qty of LED's on just one single cell, the lower voltage LED's should result in drawing even higher amps per LED. 4 to 8 LED's may result in jumping over the threshold of giving the 5000K SST-20's the advantage.
They pretty much all are, so as you increase LED count off a single cell, efficiency goes up and amps/LED goes down because of increasing batt resistance, LED wire resistance if still using one pair of wires, etc. But then again you got all that heat concentrated...
Iām not talking about the change of efficiency but the change of relative efficiency.
At low-medium current SST-20 is more efficient than XP-L HI. At high current XP-L HI is more efficient than SST-20.
I'm fairly sure that it doesn't (I have a D4V2 too). You might not see the change with your eyes though, e.g. 3000 and 1500 lumens looks pretty much the same esp. if you just looked at 3000 lumens.