Table 1 Transmittance for sun glare filters for general use of NBR15111(2013) [10]
Requirements | ||||
|---|---|---|---|---|
Ultraviolet spectral range | Visible spectral range | |||
Filter category | Maximum value of spectral transmittance τ F(λ) | Maximum value of solar UVA transmittance τ SUVA(λ) | Range of luminous transmittance (380-780 nm) τ V | |
280-315 nm | > 315-400 nm | From over % | To % | |
0 | 0.1 - τ V | τ V | 80.0 | 100 |
1 | 43.0 | 80.0 | ||
2 | 18.0 | 43.0 | ||
3 | 0.5 - τ V | 8.0 | 18.0 | |
4 | 3.0 | 8.0 | ||