I experimented with slicing the dome off the xhp70 and we’ll as trying out the xhp50.2. I also swapped to a SMO reflector and cut the bottom out then clamped down the emitter.
I did a ceiling bounce with the FX30 driver with R100 resistor added. I measured using a sliced-dome xhp70 and a dome-on xhp70. Both are N4 1A. I also compared the Liitokala against the KeepPower 5200 protected cell. I’ve already shown the Liitokala pulls more amps (7A) compared to the KeepPowers (5.7A) and here is proof they put out more light as well.
Sliced dome
KeepPower - 343
Liitokala - 377
Dome on
KeepPower - 400
Liitokala - 460
Crunching numbers:
The sliced dome looses you 14% light output on the KeepPowers and 18% on the Liitokalas. You loose lumens, but gain a more intense focus which means longer distance. Slicing the dome also helps to reduce the donut hole some.
The Liitokalas give you a 10% boost over the KeepPowers with a sliced dome and a 15% boost over the KeepPowers with the dome on. You can see the brighter output.
I cut the bottom out of the SMO reflector and fabbed some very thin copper shims to play with the emmiter to reflector distance. I also swapped to new, longer screws to clamp down the emitter for good heat transfer.
Here’s a quick comparison of the Convoy L6 with SMO reflector and xhp70 with the dome on and with it sliced off.
The sliced dome looses you 14% to 18% of lumens, but you gain a more intense focus which means longer distance. Slicing the dome also helps to reduce the donut hole some.
The smaller emitter size with the dome removed directly translates into a smaller hotspot.
All my throw numbers are in post 8.