Speras TH4 Hunting Flashlight Review
The Speras TH4 hunting flashlight offers three visible emitters and one infrared. It has USB-C charging as well as a zoom feature for all emitters. Read on!
Official Specs and Features
Here’s a link to the Speras TH4 hunting flashlight product page.
Versions
I believe there’s just one version of the Speras TH4 hunting flashlight.
Price
The Speras TH4 hunting flashlight sells for $149 with the cell and accessories shown in this post.
What’s Included
- Speras TH4 hunting flashlight
- 5000mAh 21700
- Charging cable
- Remote (wired) switch
- Spare o-rings (2)
- Weapon mount
- Manual
Package and Manual
Build Quality and Disassembly
Zoomable flashlights don’t have a great reputation among flashlight enthusiasts. The Speras TH4 hunting flashlight offers more than just zoom, though. The build quality is good (and certainly better than many/most zoomable lights.)
Both the head and tail have springs. The tailcap spring is much beefier, though. I couldn’t get the cell tube off the head, but the tailcap has very smooth removal.
Size and Comps
Flood: 165mm x 54mm x 25.4mm
Focus: 177mm x 54mm x 25.4mm
217g without battery
If the flashlight will headstand, I’ll show it here (usually the third photo). If the flashlight will tailstand, I’ll also show that (usually in the fourth photo).
Here’s the test light with the venerable Convoy S2+. The version you see below is a custom Convoy S2+ host that’s been laser engraved by GadgetConnections.com. I did a full post on an engraved orange host right here! Or just go straight to GadgetConnections.com to buy your Convoy S2+ now!
Also above is the light beside a TorchLAB BOSS 35, an 18350 light. I reviewed the aluminum version of that light in both 35 and 70 formats. I also reviewed that specific edition, the “Oveready BOSS FT Collector Vintage Brass” 35. I love it!
Retention and Carry
While the tailcap does have a loop that would accommodate a lanyard one is not included.
What is included is this weapon mount. This must be a sort of industry-standard mount – we’ve seen it before with other lights. It works great.
The shot below might not be the ideal placement for mounting a weapon light, but it’s all I’ve got.
Power and Runtime
The Speras TH4 hunting flashlight is powered by a single lithium-ion cell. A 5000mAh 21700 is included. It appears to be a standard cell.
The cell goes into the light positive end first.
All the modes for every visible emitter are ramping and have a highest and lowest (discrete) mode. Because of that, I tested a runtime only on the highest output with the white emitter.
I don’t know what the deal with that bump toward the end is about. It’s a sort of last-gasp effort from the cell. It’s fine, as the light still shuts off with low voltage protection.
Charging
Charging takes place via a USB-C port near the tail end.
A USB to USB-C cable is included.
Charging is not quick, requires over 5 hours, and has a good bit of weirdness. But it works fine.
Modes and Currents
| Mode | Mode Claimed Output (lm) | Claimed Runtime | Measured Lumens | Tailcap Amps |
|---|---|---|---|---|
| Green | 200 | 2.4h | – | 2.26 |
| White (Highest) | 800 | 2.4h | 673 (0s) 602 (30s) |
6.64 |
| White (Lowest) | 24 | 48h | 18 | – |
| Red | 150 | 2.4h | – | 1.62 |
| IR | – | – | – | 1.64 |
Pulse Width Modulation
PWM on the Speras TH4 hunting flashlight is present, and not great. Below you can see the PWM for low and high of the white emitter zoomed in and out.
For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor. Also, here’s the light with the worst PWM I could find. I’m adding multiple timescales, comparing them to the test light will be easier. Unfortunately, the PWM on this light is so bad that it doesn’t even work with my normal scale, which is 50 microseconds (50us). 10ms. 5ms. 2ms. 1ms. 0.5ms. 0.2ms. In a display faster than 0.2ms or so, the on/off cycle is more than one screen, so it’d just (very incorrectly) look like a flat line. I wrote more about this Ultrafire WF-602C flashlight and explained a little about PWM.
User Interface and Operation
The Speras TH4 hunting flashlight is controlled with one tail switch. It’s a clicky e-switch as well as rotary – click for off/on and dial around for brightness selection.
There’s also a remote switch.
The remote switch attaches to the USB-C port. You can’t charge the light while using this switch.
Emitter selection is manual – this collar gets rotated to the emitter of choice. That physically moves the emitter into the opening.
Here’s the third operating option – the head twists up and down for flood or focus. It doesn’t pull straight – it must be twisted. It’s a very small twist though, around 1/8 of a rotation fully extends the head.
Here’s a UI table! The user interface is the same for whichever emitter is in position, so there’s no reason to cover that in the table.
| State | Action | Result |
|---|---|---|
| Off | Click | On (Mode memory) |
| On | Click | Off |
| On | Rotate tailswitch dial clockwise | Increase output |
| On | Rotate tailswitch dial counterclockwise | Decrease output |
There’s no strobe.
LED and Beam
Below you can see each of the four emitter options in place. This would be the “flood” setting.
The bezel is flat so headstanding doesn’t let any light escape.
Here’s the light zoomed in fully. There’s more than just glass in there. It must be some sort of focusing lens.
Here you can see all the visible emitters with both extremes – flood and focus.
LED Color Report (CRI and CCT)
Here’s CRI and CCT for both flood and focus for the white emitter. The output is very cool white and exceptionally cool white on the highest setting (regardless of zoom level). CRI is low, too.
Beamshots
These beamshots are always with the following settings: f8, ISO100, 0.3s shutter, and manual 5000K exposure. These photos are taken at floor level and the beam hits the ceiling around 9 feet away.
Tint vs BLF-348 (KillzoneFlashlights.com 219b version) (affiliate link)
I keep the test flashlight on the left, and the BLF-348 reference flashlight on the right. These photos are taken around 18 inches from the door.
I compare everything to the KillzoneFlashlights.com 219b BLF-348 because it’s inexpensive and has the best tint!
Summary and Conclusion
The Speras TH4 hunting flashlight build quality is nice. It does suffer from some of the drawbacks that many zoomable lights do, namely very bad PWM. The emitter switching feature is nice, and if you’re a hunter needing red/green/IR/white, then this is a reasonably priced way to get all that. And it’s nice to have one light that offers it all – you won’t have to switch your weapon-mounted light!
The Big Table
| Speras TH4 Hunting Flashlight | |
|---|---|
| Emitter: | Unstated white emitter |
| Price in USD at publication time: | $149.00 |
| Cell: | 1×21700 |
| Runtime Graphs | |
| LVP? | Yes |
| Switch Type: | E-Switch |
| Quiescent Current (mA): | ? |
| On-Board Charging? | Yes |
| Charge Port Type: | USB-C |
| Charge Graph | |
| Power off Charge Port | |
| Claimed Lumens (lm) | 800 |
| Measured Lumens (at 30s) | 602 (75.3% of claim)^ |
| Claimed Throw (m) | 739 |
| Candela (Calculated) in cd (at 30s) | 2720lux @ 7.308m = 145267cd |
| Throw (Calculated) (m) | 762.3 (103.2% of claim)^ |
| Claimed CCT | – |
| Measured CCT Range (K) | 7100-8900 Kelvin |
| Item provided for review by: | Speras |
| All my Speras reviews! | |
^ Measurement disclaimer: Testing flashlights is my hobby. I use hobbyist-level equipment for testing, including some I made myself. Try not to get buried in the details of manufacturer specifications versus measurements recorded here; A certain amount of difference (say, 10 or 15%) is perfectly reasonable.
What I like
- Good build quality
- Complete package
- Nice that all those emitters are built into one package
- Emitter selection is easy
- Zoom doesn’t require much twist
What I don’t like
- Fairly costly
- USB-C charging isn’t quick
- Very cool white
Notes
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