What is light-to-solar gain (LSG)?

Light-to-solar gain (LSG) is the ratio of the visible light transmittance to the Solar Heat Gain Coefficient (SHGC). LSG = Transmittance (Tvis) / SHGC. A higher LSG ratio means the sunlight entering the room is more efficient for daylighting, especially for summer conditions where more light is desired with less solar gain.

Which material has the highest spectral transmittance of solar radiation?

This study analyse spectral transmission of solar radiation of glass and plastics. The 8 h transmittances are higher than at 12 h and are higher in winter than summer. Methacrylate and smoked glass have the highest transmittance in UV, VIS and NIR ranges. Polycarbonate has the lowest transmittance in UV, VIS and NIR ranges.

How much light does glass transmit?

Light transmission is not a fixed value; it varies based on the type of glass and its treatments. Several factors can affect the percentage of light that glass transmits: 1. Glass Thickness The thicker the glass, the less light it typically transmits due to increased absorption and reflection within the material.

What is the transmission spectrum of glass?

The transmission spectrum of glass shows how light moves through it. This depends on the light’s color or wavelength. Learning about light’s behavior—bouncing, bending, and absorbing—helps engineers make better glass for things like solar panels and glasses. The type of glass and its thickness change how it works with light.

How much light does float glass transmit?

Clear Float Glass: Approximately 80-90% light transmission for standard window thickness. Tinted Glass: Ranges from 5-80% light transmission depending on the color and density of the tint. Low-E Coated Glass: Varies widely, but some types can transmit over 70% of light while blocking heat.

How does light travel through glass?

Light travel through glass involves complex interactions at both the macroscopic and microscopic levels. When light enters glass, it slows down due to the material’s refractive index, which typically measures around 1.5. This slowing effect causes light to bend, a phenomenon known as refraction.