Welcome to BLF! 
I am not sure how he modded it,other than a current boost. In stock form the light has great output and Vinh was able to get a little more out of it.
The manufacturers are catching up now. Up until a year or so ago Vinh was doubling and tripling the CD’S of a stock light.
Here are the numbers: I have Spec 1[CW] Most throw.
Spec 1 & 2:
Power Boost
1oz extra copper HS
Beam Focus
Stock Light XHP35 HI CW 6500K $200
ANSI
Lumen: 2140
Lux: 700
Throw: 1673
Spec 1 XHP35 HI CW 6500K $250 (Recommended)
ANSI
Lumen: 2400
Lux: 775
Throw: 1760m
Spec 2 XHP35 HI NW 5000K $275
ANSI
Lumen: 2150
Lux: 730K
Throw: 1709m
Here is his website:
https://skylumen.com/collections/v54-lights/products/tn42vn-throw-king-pre-order-only
ALSO THE THREAD BELOW WILL HAVE MORE INFO. MAYBE DALE DID A RESISTOR MOD.