| | | The issue is that spd blocks 99% of the visible while pdlc scatters it and let’s in 50% or more all sunroof these days are low e meaning block ir
here’s from grok
Of the em radiation that reaches the earths surface what percentages of the energy are in the ir uv and visible?
Of the electromagnetic (EM) radiation that reaches Earth's surface from the Sun, the distribution across different wavelength ranges depends on factors like atmospheric absorption and scattering. However, based on the solar spectrum and standard atmospheric conditions, here’s an approximate breakdown:
- Visible light (400–700 nm): About 43–50% of the solar radiation reaching the surface falls in the visible range. This is the portion we perceive as light, and it’s where the Sun’s output peaks.
- Infrared (IR, >700 nm): Roughly 45–50% of the radiation that makes it to the surface is in the infrared range. This includes near-IR (700 nm–2.5 µm) and longer wavelengths, which contribute to heat.
- Ultraviolet (UV, <400 nm): Around 5–7% is in the UV range, though much of the shorter-wavelength UV (like UVC) is absorbed by the ozone layer.
These percentages can vary slightly due to atmospheric conditions (e.g., clouds, pollution, or altitude), but under clear-sky conditions, visible and IR each account for nearly half of the total, with UV making up a smaller fraction. The total energy reaching the surface (solar irradiance) is about 1000 W/m² at sea level on a clear day, often referred to as the solar constant after atmospheric filtering.
Does that clarify things? Let me know if you want more detail! |
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