Emisar D4v2: How to turn off the flashlight

This page refers to features of Anduril 1.
Looking for the Anduril 2 manual?

To understand how to turn off the Emisar D4v2, you first have to understand about the colored Aux LEDs and how they relate to Off and Lockout Mode in Anduril UI (the firmware that runs on the D4v2).

Colored Aux LEDs

If you’re seeing the colored Aux LEDs, you might think the light is still on when in fact you could actually be in Off.

No matter what brightness or color of the Aux LEDs, you’re either in Off or Lockout Mode.

What mode you’re in depends on how the Aux LEDs are configured for these modes.

D4v2's colored Aux LEDs Colored Aux LEDs means you’re in Off or Lockout Mode


Off is probably the mode you’re trying to get to when you’re thinking about turning the flashlight off. In this mode, one Click on the button enters you into Ramping Mode, a mode which behaves similarly to a normal flashlight’s “on,” with the primary white lights turned on.

Lockout Mode

Lockout Mode is for keeping the flashlight in a safe state so you don’t accidentally turn on the light in your pocket and burn yourself (yes, this is possible). In this mode, the primary white lights (not the Aux LEDs) are only on when you’re pressing down on the button.

Which mode am I in?

How can you tell which mode you’re in? I have my own setup where I configure the brightness of the Aux LEDs to let me know which mode I’m in.

Without configuring the flashlight, in either mode, you can press a single Click:

  • If the primary white light comes on only momentarily when the button is pressed, then you’re in Lockout Mode.
  • If the primary white light stays on, you were in Off and are now in Ramping Mode.

How do I get to Off in Ramping Mode?

In Ramping Mode, Click once to get it to Off.

How do I get to Off in Lockout Mode?

In Lockout Mode, 4 Clicks will get you to Off.

Doesn’t keeping the Aux LEDs on drain the battery?

From a thread in Budget Light Forum about the Aux LEDs current draw:

D4V2 high brightness:
Red - 3.00mA
Yellow - 4.13mA
Green - 1.26mA
Cyan - 2.52mA
Blue - 1.35mA
Pink - 4.20mA
White - 5.29mA

D4V2 low brightness:
Red - 0.08mA
Yellow - 0.13mA
Green - 0.06mA
Cyan - 0.10mA
Blue - 0.06mA
Pink (now violet) - 0.12mA
White - 0.17mA

If you had the D4v2 on Red at 3mA at the highest brightness on a 3000mAh 18650 battery, it would take about 50 days to fully drain the battery. You’re probably fine leaving the Aux LEDs on in Off or Lockout Mode.

Still confused?

When first using the D4v2 myself, I had a fair share of confusion as to where I was in the Anduril UI diagram. Once I understood how the Aux LEDs related to Off and Lockout Mode, things became a lot more clear.

Honestly, Anduril UI can be really confusing when you first encounter it. It’s designed for flashlight enthusiasts, and there’s no shame in not knowing what’s going on. Interfaces with modes are notoriously tricky to understand and learn.

In the first few weeks of owning my Emisar D4v2, I just unscrewed the back cap to turn it off. You can do the same until you get the hang of Anduril UI.

The path forward is illuminated

Hopefully, I’ve been able to help shine the light of knowledge and understanding for you to see how to think about the UI on this fun little flashlight.

Questions? Comments? I'd love to see your message in my inbox. Send me an email.

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