Emisar/EDC

Emisar D4K

Name: Emisar D4K
Brand: Emisar
Price: 40 USD
Availability: InStock

The 21700 evolution of the D4V2 with USB-C charging. The D4K is Hank's modern masterpiece — more output, longer runtime, and all the features you'd want.

Beam profile

Flood, about 44° wide. Wide and even — light where you are, not where you're pointing.

Estimated from 3,500 lm ÷ 7,500 cd — how this works

$40

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Specifications

Output: 3500lm
Peak intensity: 7500cd
Beam distance: 173m
Emitter: Nichia 519A 4500K
Colour rendering: 95 CRI
Beam type: Flood
Cell: 21700
Runtime: 1.5 hrs (turbo)
Modes: Ramping + Stepped
Interface: Anduril 2
Water/dust: IP67
Dimensions: 4.3 x 1.2 in
Weight: 3.5 oz
Warranty: Manufacturer Limited

Manufacturer figures, measured to ANSI FL1 where the brand states it.

Features

High CRI (90+)Anduril UI Aux LEDs Waterproof (IP67+)Pocket Clip Lockout Mode

What owners report

Emisar D4K/5 sources reviewed

Described by reviewers as the forefront of custom hot-rod flashlights: you choose materials, emitters, driver, switch and accessories, and the result is a light configured for you rather than for a market segment. The auxiliary LEDs draw specific praise for how they look, and one search-and-rescue user called the geometry flawless for hands-free work — small and light enough to wear on a helmet for hours. The optional boost driver gives higher, better-regulated output and reviewers strongly recommend specifying it.

Three honest limits. There's no USB-C charging and no reverse charging, so the cell comes out to be charged — a real gap now that most competitors include it. There's a gap between the marketing figure and reality: rated at 3,800 lumens with a real-world ceiling nearer 2,000. And reviewers say that for sustained high output over hours, a different light is the better tool.

Consistently praised

Configure everything: materials, emitters, driver, switch and accessories
Optional boost driver gives higher and better-regulated output
Auxiliary LEDs that owners single out for how good they look
Geometry works well for hands-free and helmet-mounted use
Light enough to wear on a helmet for hours

Common complaints

No USB-C charging and no reverse charging — the cell comes out
Rated 3,800 lumens with a real-world ceiling nearer 2,000
Not the right light for hours of sustained high output
Specifying a configuration is daunting if you don't know what you want
Ordering goes through a small-batch supplier with long lead times

Questions people ask

Should I pay for the boost driver?: Reviewers strongly recommend it. It gives higher output and, more importantly, holds it steadily as the cell drains rather than letting brightness sag.
Why no USB-C charging?: Hank's designs prioritise size and simplicity over onboard charging. It's the most-cited gap now that even budget brands include it, and it means owning a separate charger.
Does it really make 3,800 lumens?: Briefly at best. The realistic ceiling is nearer 2,000, and sustained output is lower again. That's normal for a quad this size but worth knowing against the spec.
D4K or D4V2?: The D4K is the newer design with the boost-driver option and better regulation — generally the better light. The D4V2 is cheaper with a broader configuration menu.

Sources (5)