Review: Skilhunt EC300 - a high-CRI 21700 flooder with USB-C powerbank and colored secondary LEDs

This Skilhunt EC300 was provided by Skilhunt for review.


Devices that try to perform multiple functions often do all of them poorly. With the EC300, Skilhunt has produced an excellent white flashlight that's also a good USB powerbank and a serviceable multicolor flashlight. Output is sufficient for most use cases, though the thermal throttling is a bit aggressive for my tastes. Color rendering is excellent, and the tint is a close match to afternoon sunlight. Its powerbank function is capable of powering USB devices at nearly 15W and is compatible with all standard USB-C power supplies and cables, though it does not take advantages of any of the higher power standards like QC or PD.

I find 21700 lights too large and heavy for casual pocket carry, but this is one of the smaller options on the market and it can be carried in average pants pockets if necessary. The extra capacity over an 18650 can make the difference between only needing to carry a single device and bringing a separate powerbank. The EC300 is waterproof with an IPX8 rating, however the USB cover comes open easily, and I would recommend caution in extremely wet environments.

What the EC300 doesn't have is a sub-lumen moonlight mode or output adjustment for the colored modes. The red mode in particular is quite bright at 40 lumens. A 0.3 lumen low white is advertised, but it looks and tests higher. While it's suitable for situations where some authority mandates the use of red light, lower output would be better for actually preserving dark adaptatation.

Overall, the EC300 is a versatile flashlight and powerbank, and it is recommended.


Spec -
Battery 1x21700
LED Luminus SST-20 x4
Color temperature 4332K
Color rendering index 97
Max output 1855 lm
Max throw 142 m
Max sustainable output 652 lm
Max output at 50% battery 1424 lm
Best efficiency 123 lm/W
Candela per lumen 2.5 (floody)
Length 115 mm
Head diameter 29.5 mm
Weight 81 g
Weight with battery 153 g
Environment IPX8 (submersible)
Charging USB-C
Power from USB without battery Low/colored modes
Low Voltage Protection (LVP) Yes
Lockout Electronic and mechanical
Approximate price $68 (without battery), $81 (with battery)
Rating ★★★★☆ (recommended)


  • High CRI (optional)
  • Pleasant tint
  • Fast + broadly compatible USB-C charging
  • Powerbank function with nearly 3A output
  • Compact for a 21700 light
  • Good battery compatibility


  • Low modes could stand to be lower for dark adaptation
  • Timed stepdown level of 652 lm is lower than I'd like
  • USB flap comes open easily

Details and technical analysis


The EC300 offers a choice of low-CRI cool white and high-CRI neutral white, both using Luminus SST-20 LEDs. It can be ordered with or without a 5000 mAh protected 21700 battery, and only comes in grey anodized aluminum at this time.

This is the high-CRI neutral white version.


The EC300 includes a pocket clip, lanyard, carrying pouch, USB A-C cable, spare O-rings, and user manual. A 5000 mAh protected 21700 battery is optional.

Modes and user interface


Mode Advertised Lumens Estimated Lumens Estimated throw (FL1 meters) Candela
L2 0.3 1 - -
L1 3 7 - -
M2 26 30 17 75
M1 98 135 36 329
H 274 384 62 960
T2 750 1028 101 2550
T1 1500 1855 142 5007
Red 10 40 - -
Green 28 30 - -
Blue 7.5 61 - -

The following blinking modes are also available:

  • Strobe
  • SOS
  • Red beacon
  • RGB strobe

User Interface

State Action Result
Off Click Medium group
Off Long-press Low/color group
Off Double-click High group
Off Triple-click Strobe group
Medium group Double-click High group
High group Double-click Medium group
Low group Double-click Toggle white/color
On (except strobe) Long-press Cycle modes within current group
Strobe Double-click Cycle blinking modes
On Click Off
Off Quad-click Lockout
Lockout Quad-click Low group

Every group memorizes the last-used mode from that group. The powerbank feature is available in lockout mode; slightly loosening the tailcap locks out the light mechanically, disabling the powerbank feature and all standby power consumption.

While there's a lot of functionality on a single button, I don't find the UI particularly difficult to remember. Perhaps it's not the best fit for someone who believes they'll need quick access to RGB strobe in an emergency, but the average person will find a useful medium mode with no instruction at all.

Output, runtime, and efficiency

Mode Estimated lumens Minutes to 80% Minutes to 50% Minutes to 10% Efficiency (lm/W) Current (mA)
Standby 14 years 0.04
L2 1 30 days 35 7
L1 7 11 days 90 19
M2 30 3 days 114 64
M1 135 17 hours 110 299
H 384 304 350 354 120 767
T2 1028 4 203 262 121 2480
T1 1855 1.3 1.8 219 123 6330
R 40 14 hours 40 362
G 30 14 hours 30 359
B 61 14 hours 42 357

I suggest taking the numbers for the colored modes with a grain of salt, but the red and blue do look both brighter than advertised and at least as bright as the green to my eyes. My output estimates exceed what's advertised in every mode; that's good thing in higher modes, but not in low.

Efficiency is a bit below what I've come to expect from Skilhunt. While high-CRI SST-20s have never been the most efficient emitters, four of them should have higher efficiency than one LH351D, for example.

Light quality

Readings are taken from the center spot diffused with DC Fix diffusion film using an X-rite i1Pro spectrophotometer.

Mode Color Temperature Tint Duv CRI CRI R9 (deep red) CRI R12 (deep blue)
L2 4681K 0.00175 (slightly green) 93 93 71
L1 4169K 0.00126 (neutral) 96 96 75
M2 4186K 0.00125 (neutral) 96 96 75
M1 4125K 0.00157 (slightly green) 97 98 76
H 4332K 0.00155 (slightly green) 97 96 77
T2 4179K 0.00134 (neutral) 97 91 79
T1 4199K 0.00003 (neutral) 96 87 80

I've seen very few flashlights that do a better impression of afternoon sunlight than this. There's little shift from mode to mode, and the color rendering is excellent.


EC300 (first) vs Zebralight SC64c LE (second)


Batteries and charging

The EC300 uses a single 21700 battery; a 5000 mAh protected button top is optionally included. All 21700 batteries I tested from unprotected flat-tops to an extra-long Acebeam with a USB port fit and function normally, but vigorous shaking will cause an unprotected flat-top to break contact and turn off the light. Protected 18650s can be used without a spacer, but are subject to rattling. Combining the maximum mode and powerbank function should not exceed 10A, meaning nearly all 21700 batteries can safely provide all the power the EC300 might use.

Charging a 5000 mAh cell takes less than 3 hours, and the powerbank function can output nearly 3A at 5V (15W). Both charging and powerbank functions work with the light on. Low modes can be used from USB power without a battery installed.

Size and ergonomics

The EC300 is marketed as an everyday carry light and can be carried in a typical pants pocket, but all 21700 flashlights are on the large side for that use case. The switch is raised and not difficult to find by feel, though it's opposite the USB port, which is also raised. Squeezing to press both reliably actuates the switch.

The pocket clip is usable, but could be improved with more ramp as Skilhunt has done with the M150 and M200 clips. The EC300 clip can require some effort to insert in many pockets.

Modification potential

The bezel unscrews easily providing access to a custom MCPCB with four white LEDs and one single-package RGB unit. Reflowing LEDs should be easy enough, but sourcing a replacement MCPCB may be difficult. The optic is the popular Carclo 10623, and can be replaced with other optics in that series such as the more focused 10621. The 10621 produces signiicant artiacts with the colored LED, but works well with white.

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