The Gaciron CETUS-1700 is a bright, well-built 1700-lumen bike light with a sharp cut-off beam, wireless remote, and USB-C fast charging, generally considered good value around €56–$125 AUD. However, it lacks STVZO certification, has a single-button interface with beeps, and its mount fits 31.8mm bars but not 22mm bars.
Pros
- Very bright 1700-lumen output with a sharp anti-glare cut-off line123
- Good value for the price (around €56–$125 AUD)124
- Wireless remote control included for easy mode switching254
- USB-C charging with fast charge time (~2 hours)146
- Sturdy, premium build quality (aluminum alloy/steel) with secure mounting436
- IPX6 waterproof rating256
- Swappable battery compliant with upcoming EU replaceable battery rules1
- Vibration sensor auto on/off (turns off after 2 minutes of inactivity)25
Cons
- Single-button operation requires cycling through all modes; hidden modes need button combinations; every press beeps (cannot be disabled)1
- No STVZO certification, so not legal for road use in Germany1
- Mount does not fit 22mm handlebars; designed for 31.8mm bars52
- Remote control pairing can be difficult initially; strap not very convenient74
- Gets very hot at maximum output without airflow7
- Low beam may be too dim for very dark conditions; beam not wide enough for right-side illumination when turning35
- When battery is low, defaults to low power mode that cannot be adjusted3
Key Facts
- Max output 1700 lumens; modes include 300 lm low, 600 lm high-low, 450 lm high-beam 1, 900 lm high-beam 2, plus blink and daytime running modes123
- Measured weight 181–187g42
- Battery capacity 4200 mAh; runtime about 2 hours at 1700 lm, up to 24 hours in low/flashing modes742
- USB-C charging at 2A; full charge in about 2 hours146
- IPX6 waterproof rating256
- Aluminum alloy and nylon construction; swappable battery accessible via Torx T3 screw14
- Mount fits 31.8mm handlebars (and 25.8mm with adapter), not 22mm bars; GoPro-compatible mount included257
- No Bluetooth or ANT+ integration; no STVZO certification1
Sources
- 1MyBikePartsGaciron CETUS-1700 im Test: Taugt die günstigste hängende Fernlicht-Lampe was?
- 2JEL ReviewsGaciron CETUS 1700 Review: 1700 Lumen SMART Bike Light w/ Wireless Remote
- 3Jon BergmannCETUS-1700 Underneath Mounted Bike Light - Full Review
- 4VDS Rides N' RambleCetus-1700 Bike Light – Can It Really Turn Night Into Day?
- 5BACONBUTTTIES EBIKE Review HUBGaciron Cetus-1700 Fantastic ebike headlight! Super illuminating Bicycle headlight 1700 lumens
- 6durianriderGaciron Cetus 1700 Light Review
- 7Tom10 CraftedCetus 1700 Bike Light Review – Is it Better Than Syncros Nanaimo?
Reviews & Ratings
14:56The reviewer tests the Gaciron CETUS-1700 (also referred to as CETUS 1300), a 1700-lumen bike light sent to him free of charge by Gaciron. He finds it a good overall light for around €56, praising its sharp cut-off line, swappable battery, and solid runtime, while criticizing its single-button operation, bulky design, and lack of STVZO certification. He notes it is not Bluetooth-enabled and requires remembering button combinations for hidden modes.
06:44The reviewer tested the Gaciron CETUS-1700 bicycle light and found it to be a solid, well-built product. He praised its sturdy construction, easy attachment system, and excellent beam pattern. He noted a concern about battery life initially, but after a full test, he found it lasted about seven hours on full brightness, which he considered good. Overall, he concluded it might become his favorite light.
03:12The reviewer discusses the Gaciron CETUS-1700 bike light, which they received for free from the Chinese brand. They used it for several weeks and were impressed with its performance, build quality, and features. They highlight its narrow road-specific beam, good quality bracket, USB-C charging, and high brightness of 1700 lumens. They also mention the light's aerodynamic design claim, waterproof rating, and lock function, and they recommend it as a strong, affordable high-powered light.
16:50The reviewer tests the Gaciron CETUS-1700 headlight, noting its extreme brightness and effectiveness in dark conditions, but encounters a mounting issue with his specific handlebars.
10:41The reviewer provides a detailed look at the Gaciron CETUS-1700 bike light, highlighting its features, performance, and practical use. They test it on an e-bike in a dark golf course and are impressed by its brightness and ability to illuminate the surroundings, making night riding safer and less intimidating.
11:56The reviewer unboxes and tests the Gaciron CETUS-1700 bike light, highlighting its high and low beams, remote control, and 1700 lumen output. They compare it to their previous light, the Synchros NMO, and discuss build quality, battery life, and performance in cold conditions.
09:48The reviewer praises the Gaciron CETUS-1700 bike light, highlighting its powerful 1700 lumens output, wireless remote control, vibration sensor, and anti-glare feature. He notes its high-quality construction, excellent mounting system, and reasonable price of $125 Australian.
Use code MyBikeParts (10% off) when ordering from Gaciron
MyBikeParts (10% off)jonbergmanntom10craftedWhere to Buy
| Rating | ||||
|---|---|---|---|---|
gaciron-shop.com Affiliate · MyBikeParts | €62 | $62 | – | – |
 aliexpress.com#1005009119494189Affiliate · MyBikeParts | €62 | $62 | £52 | 4.9(14) |
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