Optic compartment is sized for a quad optic. I think they’re something like 8mm tall. The optic compartment too short to use an emitter properly sized for a single-emitter.
And there’s no point in using the quad star with quad optic and just one emitter installed. Sure it would work, but it would be inferior in every way to a D4 with all 4 emitters installed.
If your goal is a single-18650 light with sideswitch, single-emitter and Anduril, your best bet is to probably obtain a side-switch light of your choice and mod or replace the driver.
+12
Currently only 5kK SST40.
I heard that Sofirn also has plan to release 4kK (SST40) version , not clear though when that will actually be available.
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is there any other flashlight with SST40 4000K ?