Solar neutrino
The troland (symbol Td), named after Leonard T. Troland, is a unit of conventional retinal illuminance. It is meant as a method for correcting photometric measurements of luminance values impinging on the human eye by scaling them by the effective pupil size. It is equal to retinal illuminance produced by a surface whose luminance is one nit when the apparent area of the entrance pupil of the eye is 1 square milimeter. [1]
The troland typically refers to the ordinary or photopic troland, which is defined in terms of the photopic luminance:
where L is the photopic luminance in cd m-2 and p is pupil area in mm2
A scotopic troland is also sometimes defined:
where L′ is the scotopic luminance in cd m-2 and p is pupil area in mm2
Conversions to other units
| 1 troland | 10 kcd/m^2 (kilocandelas per square meter) |
| 10000 cd/m^2 (candelas per square meter) | |
| 1×10^7 mcd/m^2 (millicandelas per square meter) | |
| 1×10^10 mucd/m^2 (microcandelas per square meter) | |
| 1 cd/cm^2 (candela per square centimeter) | |
| 3.142 La (lamberts) (unit officially deprecated) | |
| 2919 footlamberts (unit officially deprecated) | |
| 2919 equivalent foot-candles (unit officially deprecated) | |
| 31416 blondels (unit officially deprecated) | |
| 10000 nit (nits) (unit officially deprecated) | |
| 3.142×10^7 skots (unit officially deprecated) | |
| 1 stilb (unit officially deprecated) |
Conversions from Other Units
| 1 kcd/m^2 | 0.1 trolands |
| 1 cd/m^2 | 1×10^-4 trolands |
| 1 mcd/m^2 | 1×10^-7 trolands |
| 1 mucd/m^2 | 1×10^-10 trolands |
| 1 cd/cm^2 | 1 troland |
| 1 La | 0.3183 trolands |
| 1 footlambert | 3.426×10^-4 trolands |
| 1 equivalent foot-candle | 3.426×10^-4 trolands |
| 1 blondel | 3.183×10^-5 trolands |
| 1 nit | 1×10^-4 trolands |
| 1 skot | 3.183×10^-8 trolands |
| 1 stilb | 1 troland |
Physical quantities
- luminance
- equivalent luminance [2]
Unit system
centimeter-gram-second (cgs) [2]
Unit status
officially deprecated [2]
Basic unit dimensions
[length]^(-2) [luminous intensity] [2]
Comparisons
- ≈ 0.8 × luminance of a kerosene candle (≈ 12000 cd/m^2 )
- ≈ luminance of a sperm candle (≈ 10000 cd/m^2 )
- ≈ luminance of an average daytime clear sky (≈ 8000 cd/m^2 )[2]
See also
References
43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.