Function 

1. Glare reduction / visual comfort
   One of the principal advantages is reducing the harsh brightness or glare that escapes the tank and can be uncomfortable for viewers. By “shading” the light’s edges, it softens the visual impact.

2. Light spillage control
   It helps keep more of the emitted light directed downward (into the water) rather than sideways or upward, thus improving efficiency of usable light inside the aquarium.

3. Preservation of reef-safe illumination
   The visor is designed so that it does not interfere significantly with the useful light spectrum for corals. In other words, it is intended to block unwanted stray beams while still maintaining the reef-safe output of the light.

4. Ease of installation & removal
   You can mount or remove it quickly, which is useful if you want to access the light for maintenance, cleaning, or adjustments.

Limitations 

• Because it partially “shades” the light edges, there may be slight reduction in peripheral illumination or uniformity near the edges of the tank—though that is presumably minimal by design.

• It must be properly aligned: if misaligned, it could block or unevenly shade parts of the useful light.

• It’s only compatible with the G2 115 model (or possibly models that share the same aperture/geometry) — you can’t use it with other luminaires unless the fit matches exactly.

• Because it’s an accessory (not a core component), it adds slightly to the profile, which may matter in settings with low clearance above the tank.

How It Integrates with ReefLED G2 115

• The Red Sea ReefLED G2 series (including the 115) supports features like anti-glare recessed lenses and a well-engineered light spread. The visor builds on that by further controlling stray light.

• The G2 115 light itself is specified to deliver 115 W of power, dimensions 15.5 × 13.5 × 5.7 cm, and a spectral range from ≈ 10,000 K to 23,000 K in its tunable modes.

• The visor is one of several accessories in the Red Sea ecosystem (mounting arms, hanging kits, etc.) designed to complement and enhance the lighting setup.

In conclusion, the ReefLED G2 115 Visor from Red Sea is a simple yet effective accessory that enhances both the functionality and aesthetics of your aquarium lighting by reducing glare, controlling light spill, and maintaining a clean, focused illumination for an optimal reef-viewing experience.