I didn't realize the D2Flex had been discontinued. It was a very popular board I'd seen in many builds. Anyway it's probably just as well in your case because the D2Flex is only a PWM dimmer, not a regulator. If you had hooked an SST-90 up to 14 volts by way of a D2Flex, the LED would have blown instantly. The TaskLED H6CC and the H6Flex are OK at that voltage, but only 6.7 amps.
Try Der Wichtel's
9 amp regulator. He has both single mode and adjustable output 9 amp drivers. There is also the DIWdiver
10 amp regulator. DIWdiver's is a linear regulator. Since the excess voltage is burned off as heat, you're a little more limited to the choice of batteries, 4*NiMH being idea. Those are the only two I am aware of.
If you really want a D2Flex, post a want to buy thread over in the
B/S/T Forum. But then you have to figure on a battery configuration that can also run direct drive before you add the D2Flex. Overdog had one of the first 4*AA NiMH
shorty Mag's I'd seen. The internal resistance of the AA NiMH is high enough for the voltage to drop to the right level. If you tried it with D cells would probably be too much.
... and :welcome:
Edit: I missed the cover glass. Try a 52.1mm*1.90mm
UCL lens for a MagLite. I'm a little unsure what (no LED) means. If it's the kind of hotwire that sets newspaper on fire, you need the 52.1mm*2.00mm Borofloat lens. If it's a R.O.P. or any kind of LED, the UCL would be OK and has an extra 5% transmission.