Description
This solar-powered 20mm green dot sight delivers unlimited runtime for rifles and carbines without the constant battery anxiety.
Never worry about a dead optic when it matters most. The HE403C-GR combines Holosun’s Solar Failsafe technology with a 50,000-hour CR2032 battery to ensure your sight stays operational in any lighting condition, from bright sunlight to complete darkness. The crisp 2 MOA green dot offers faster target acquisition than traditional red dots, especially for shooters with astigmatism or difficulty seeing red wavelengths, while the motion-sensing Shake Awake feature keeps your optic ready the instant you need it.
Key Features
- Dual Power System: Solar panel automatically adjusts brightness based on ambient light, while the CR2032 battery provides 50,000 hours of backup power, ensuring the sight remains operational even when the battery fails
- Motion-Activated Readiness: Shake Awake technology powers the LED down after periods of motionlessness and instantly reactivates with the slightest movement, extending battery life while keeping the sight ready
- Green Super LED Reticle: 2 MOA green dot at 540nm wavelength provides faster eye acquisition and up to 4x greater power efficiency at high brightness settings compared to standard red LEDs
- Versatile Mounting Options: Includes both a lower 1/3 co-witness mount (1.63″) and a low profile mount (0.75″) with Aimpoint Micro footprint compatibility for maximum mounting flexibility
Important Compatibility Notes
- Mount Compatibility: Uses Aimpoint Micro T1/H1 footprint—compatible with most aftermarket mounts designed for Aimpoint Micro series
- Night Vision: Compatible with night vision devices at the two lowest brightness settings
Why We Carry It
The HE403C-GR represents Holosun’s successful fusion of affordability and innovation in the micro red dot market. Since introducing Solar Failsafe technology, Holosun became the first manufacturer to create an electronic optic that runs solely on light power when available. The green LED variant addresses a real need for shooters who struggle with red dot visibility or have astigmatism—green wavelengths at 540nm are naturally easier for the human eye to acquire and appear less distorted.
Frequently Asked Questions
Will the green dot work better for my astigmatism than a red dot?
Many shooters with astigmatism report that green dots appear crisper and less distorted than red dots, though individual results vary. The green wavelength at 540nm tends to produce less of the “starburst” effect that astigmatism causes with red LEDs. However, the most significant factor is typically the quality of the LED itself. If you currently struggle with red dot clarity, the HE403C-GR’s green Super LED is worth trying, but keep in mind that this varies widely per user case.
How does the Solar Failsafe actually work in practice?
The solar panel on top of the housing automatically powers the sight when sufficient ambient light is available, even with a dead battery. In bright conditions, the solar cell independently runs the optic and automatically adjusts brightness to match light levels—brighter outdoors, dimmer indoors. The CR2032 battery serves as a backup for low-light or indoor use. Users report that the solar function works reliably in normal daylight conditions, effectively giving you unlimited runtime during daytime use. The battery primarily gets used during dawn/dusk shooting or indoor range sessions.
Does Shake Awake really save battery, and how sensitive is it?
Shake Awake significantly extends battery life by powering down the LED after a programmed period of motionlessness (default 10 minutes, adjustable from 10 minutes to 12 hours or disabled entirely). The motion sensor is quite sensitive—many users report the optic wakes from even walking near the firearm or gentle table vibrations. While this sensitivity means the optic stays “awake” more than you might expect if stored on a shelf with foot traffic nearby, it also ensures the sight instantly activates when you grab your rifle. The 50,000-hour battery life calculation already accounts for typical Shake Awake usage patterns.
Spec Sheet
Optical Data
- Reticle: 2 MOA Dot
- Light Wavelength: 540nm
- Reticle Color: Green
- Parallax Free: Yes
- Unlimited Eye Relief: Yes
- Magnification: 1x
- Multi-Coatings: Yes
Electronic Data
- Power Source: Solar & Battery
- Battery Type: CR2032
- Battery Life (Hours): 50,000 (at setting 6)
- Brightness Setting: 10 DL & 2 NV
Mechanical Data
- Housing Material: 6061 T6 Aluminum
- Surface Finish: MAO
- Adjustment per Click: 0.5 MOA
- W&E Travel Range: ±50 MOA
Physical Data
- Window Size: 20mm Diameter
- Dimension (in): 2.45″ × 1.43″ × 1.6″
- Weight (oz): 2.82
Environment Data
- Storage Temperature: -40°~70°C
- Working Temperature: -30°~60°C
- Submersion: IP67
- Vibration: 1000G
