Core Selling Points 2-in-1 Lighting Design: Integrates front light and rear light functions. The front light has a maximum brightness of 500 lumens, and the rear light has a maximum brightness of 100 lumens. Both can be turned on simultaneously, achieving a combined maximum brightness of 600 lumens. The rear light serves both as night lighting and a daytime safety warning light, effectively enhancing visibility during cycling and ensuring riding safety. Multi-Gear Lighting Modes: Both the front light and rear light are equipped with 4 lighting modes, which can be flexibly switched according to different scenarios. The front light includes high constant brightness (500 lumens), medium constant brightness (250 lumens), low constant brightness (100 lumens), and low flash (100 lumens) modes. The rear light includes white constant brightness (100 lumens), white daytime flash (5 lumens), red constant brightness (100 lumens), and red flash (5 lumens) modes, meeting diverse brightness needs. Long Battery Life and Convenient Charging: Built-in with a 2500mAh 18650 lithium battery, the battery life varies significantly across different lighting modes. Among them, the rear light in red flash mode has the longest battery life, up to 81 hours and 40 minutes, while the front light in low flash mode has a battery life of 10 hours and 50 minutes. It supports flexible charging methods and can be powered by adapters, laptops, power banks, car chargers, etc., taking only about 4 hours to fully charge. Clear Battery Level Indication: Equipped with a 3-color battery level indicator, which can intuitively show the remaining battery power. It displays blue when the battery level is 61%-100%, yellow when 21%-60%, and red when 1%-20%. During charging, a flashing red light indicates that it is being charged, and a steady blue light indicates that it is fully charged. Moreover, the front light in medium constant brightness (250 lumens) mode and all modes of the rear light can be used normally during charging. Waterproof and Durable Performance: It has a waterproof rating of IPX4, with a silicone waterproof ring at the lens. It can be used normally even in rainy or heavy rain weather, adapting to complex outdoor riding environments. Part of the shell is made of aluminum alloy, and it is matched with a sturdy bracket. The bracket supports large-diameter installation, featuring strong stability and effectively extending the service life of the product. Safe Lighting Design: The front light has an irradiation distance of over 200 meters and a floodlight angle of 95°, which can maximize the field of view and reduce riding blind spots. It is designed with side lights to further improve lateral visibility during cycling. Adopting a symmetrical light spot design, the light spot effect remains consistent whether the light is installed above or below the handlebar, ensuring lighting safety under different installation methods. Intelligent Temperature Control Protection: It is equipped with an intelligent high-temperature protection function. When the temperature of internal components is detected to be 75°C or above, the light will automatically switch to the medium brightness mode of 200 lumens. When the temperature drops to 65°C or below, it will return to the original brightness mode. If the temperature rises to 95°C or above, the light will automatically turn off to prevent internal components from being damaged due to high temperatures. Lightweight and Flexible Installation: The product has a net weight of only 106g, with a compact and lightweight overall design, which will not add extra burden to cycling. It supports three installation methods: it can be installed above the handlebar (supporting 360° rotation), below the handlebar, and is also compatible with the Gaciron H15P helmet bracket (needs to be purchased separately, suitable for BL 08X helmet installation). At the same time, it is compatible with Gaciron multi-functional brackets such as H09 and H10, meeting the needs of different usage scenarios and installation requirements. A wired remote control can be optionally equipped, enabling safe and convenient switching of front light lighting modes (the remote control does not support rear light operation). II. Detailed Specifications (I) Basic Information The model is V20C-600, the brand is GACIRON, and the product type is an MTB bike headlight, adopting a 2-in-1 design of front light and rear light. (II) Light Source and Brightness The light source adopts CREE XPG3. The front light has a maximum brightness of 500 lumens, and the rear light has a maximum brightness of 100 lumens. When the front light and rear light are turned on simultaneously, the combined maximum brightness reaches 600 lumens. (III) Light Beam and Angle The front light has a floodlight angle of 95°, and the rear light has a floodlight angle of 160°. The light beam irradiation distance is over 200 meters, providing sufficient field of view for cycling. (IV) Battery and Charging It is equipped with an 18650 lithium battery with a capacity of 2500mAh. The charging input specification is Micro 5V/0.7A, and it takes about 4 hours to fully charge. It is compatible with various devices such as adapters, laptops, power banks, and car chargers for charging. (V) Battery Life (Reference Value) Battery life of the front light in different modes: approximately 1 hour and 55 minutes in high constant brightness (500 lumens) mode, about 3 hours and 20 minutes in medium constant brightness (250 lumens) mode, around 8 hours and 20 minutes in low constant brightness (100 lumens) mode, and roughly 10 hours and 50 minutes in low flash (100 lumens) mode. Battery life of the rear light in different modes: about 10 hours in white constant brightness (100 lumens) mode, approximately 63 hours and 20 minutes in white daytime flash (5 lumens) mode, around 40 hours in red constant brightness (100 lumens) mode, and roughly 81 hours and 40 minutes in red flash (5 lumens) mode. When the front light is in high constant brightness (500 lumens) and the rear light is in white constant brightness (100 lumens) and both are turned on simultaneously, the battery life is about 1 hour and 30 minutes. (VI) Protection and Material It has a waterproof rating of IPX4, with a silicone waterproof ring at the lens, allowing normal use in rainy and heavy rain weather. Part of the shell is made of aluminum alloy, and the lamp body is made of plastic. At the same time, it is equipped with an overheat protection circuit to improve the durability and safety of the product. (VII) Size and Weight The product size is 105mm × 36mm × 31mm, with a net weight of only 106g. It is lightweight and easy to carry, without adding too much burden to cycling. (VIII) Optical Parameters (Test Data) The test environment was a temperature of 25°C and a humidity of 65%. The chromaticity coordinates are x=0.3196, y=0.3337, u=0.2009, v=0.3145, and duv=0.0021. The correlated color temperature (CCT) is 6116K, the dominant wavelength is 492.1nm, the peak wavelength is 445.1nm, and the half-width is 23.3nm. The color rendering index (Ra) is 69.9. The spectral ratio is R=21.18%, G=48.68%, B=30.28%; the RGB ratio of luminous flux is R=11.9%, G=85.6%, B=2.5%; and the purity is 4.6%. The sub-color rendering indices are R1=69, R2=72, R3=73, R4=72, R5=71, R6=64, R7=78, R8=-26, R9=-26, R10=33, R11=72, R12=43, R13=68, R14=84, R15=65. The fidelity index (Rf) is 66.3, and the gamut index (Rg) is 95.9. (IX) Package Contents The package includes the V20C-600 lamp body, H07P bracket, Micro USB data cable, and user manual in both English and Chinese, meeting the user's needs of being able to install and use immediately after unpacking.