In situ
Spectrum 729: TG-Tierpark Unit 1000W Edit
DeleteMeasurement
| Brand |
Light Impex Henze GmbH |
|---|---|
| Lamp Product |
LIH 1000W Halide 1000W - External Ballast |
| Lamp ID |
TG-Tierpark Unit 1000W (06/2023) In situ |
| Spectrometer | FLAME UV-Vis (E) |
| Ballast | - no ballast or default/unknown ballast - |
| Reflector | |
| Distance | 600 cm |
| Age | 6 hours |
| Originator (measurement) | Thomas Griffiths |
Database entry created:
Thomas Griffiths (Tomaskas Ltd.)
19/Sep/2023 ; updated:
Thomas Griffiths (Tomaskas Ltd.)
19/Sep/2023
Colorimetry
Colorimetry is the science to describe physically the human color perception. The wavelength range 380 nm - 780 nm is visible to humans and detected by three different photoreceptors. Many Reptiles see the range 350 nm - 800 nm and have an additional UV photoreceptor in their retina.
Whereas a spectrometer measures the intensity in every tiny wavelength interval resulting in thousands of individual intensities, the human eye only measures three intensities detected by the three cones. The same is true for the reptile eye with usually three or four photoreceptors. Effectively the detailled spectrum displayed above reduces to a much compacter bar graph displayed below. The photoreceptor sensitivites from these L-Cone, M-Cone, S-Cone, and U-Cone are used, they are chosen as an average of measured reptile photoreceptor sensitivity curves. The bar graph also shows as reference the intensity seen by the three or four photoreceptors for average sunlight (id 1).
From these three numbers the colour coordinate and the correlated colour temperature for humans are calculated using the CIE standard method. I adapted this concept to a "3 cone reptile (M,S,U)" and a "4 cone reptile (L,M,S,U)". I am sure, that this adaption to other colour spaces makes sense mathematically and this is also done in scientific research regarding colour vision of animals, however I have not seen calculation of colour temperatures for other animals in the scientific literature. Even if it is hypothetical, at least this shows, how arbitrary the colour temperature is, and that the colour temperature calculated for humans does not apply to reptiles. The colour spaces also show the colour coordinates of different phases of daylight ((ids 1, 338 – 451, 511 – 513 ), indicated by crosses, coloured in the appriximate colour perceived by a human.
| Human (CIE) | 3 cone reptile | 4 cone reptile | |
|---|---|---|---|
| Cone Excitation | |||
| Colour Coordinate | ( 0.3 ; 0.33 ) | ( 0.34 ; 0.36 ) | ( 0.22 ; 0.26 ; 0.28 ) |
| CCT | 7200 Kelvin | 6300 Kelvin | 6600 Kelvin |
| distance | 0.015 | 0.015 | |
| colour space | 3-D-graph not implemented yet |
Vitamin D3 Analysis
Vitamin D3 is produced by UVB radiation around 300 nm. 7DHC/ProD3 present in the skin is converted to PreD3 when absorbing an UV photon. PreD3 can be converted back to ProD3, to Lumisterol, or to Tachysterol when absorbing another UV photon or can be converted to Vitamin D3 in a warm environment.
This process prevents any overdose of vitamin D3 from UV radiation with a spectrum similar to sunlight. As a comparison the solar spectra at 20°(id:14) and at 85°(id:21) solar angle are shown.
The ratio of the two solarmeters 6.2 (UVB) and 6.5 (UV index) readings has proven a useful and very simply number to acess the spectral shape in the vitamin-d3-active region.
Effective Irradiances
Effective irradiances are calculated for all ranges, actionspectra and radiometers currently present in this database.
The calculation method is a numerical implementation (Simpson's rule) of the formula
To learn more about calculating effective irradiances and radiometers I recommend this excellent report on UVB meters: Characterizing the Performance of Integral Measuring UV-Meters (pdf).
The numbers in the following tables can also be used to estimate certain (effective) irradiances from radiomer readings. Example: If the database lists
- range: UVB (US) = 13.8 µW/cm²
- radiometer: Solarmeter 6.2 = 19.6 µW/cm²
Ranges
total ( 0 nm - 0 nm) 9040 µW/cm² = 90.4 W/m² UVC ( 0 nm - 280 nm) 0 µW/cm² = 0 W/m² non-terrestrial ( 0 nm - 290 nm) 0 µW/cm² = 0 W/m² total2 ( 250 nm - 880 nm) 8970 µW/cm² = 89.7 W/m² UVB (EU) ( 280 nm - 315 nm) 48.6 µW/cm² = 0.486 W/m² UVB (US) ( 280 nm - 320 nm) 64.3 µW/cm² = 0.643 W/m² UVA+B ( 280 nm - 380 nm) 770 µW/cm² = 7.7 W/m² Solar UVB ( 290 nm - 315 nm) 48.6 µW/cm² = 0.486 W/m² UVA D3 regulating ( 315 nm - 335 nm) 79.3 µW/cm² = 0.793 W/m² UVA (EU) ( 315 nm - 380 nm) 722 µW/cm² = 7.22 W/m² UVA2 (medical definition) ( 320 nm - 340 nm) 94.7 µW/cm² = 0.947 W/m² UVA (US) ( 320 nm - 380 nm) 706 µW/cm² = 7.06 W/m² UVA1 (variant) ( 335 nm - 380 nm) 642 µW/cm² = 6.42 W/m² UVA1 (medical) ( 340 nm - 400 nm) 990 µW/cm² = 9.9 W/m² vis. UVA ( 350 nm - 380 nm) 534 µW/cm² = 5.34 W/m² VIS Rep3 ( 350 nm - 600 nm) 5400 µW/cm² = 54 W/m² VIS Rep4 ( 350 nm - 700 nm) 6770 µW/cm² = 67.7 W/m² purple ( 380 nm - 420 nm) 875 µW/cm² = 8.75 W/m² VIS ( 380 nm - 780 nm) 7150 µW/cm² = 71.5 W/m² PAR ( 400 nm - 700 nm) 5860 µW/cm² = 58.6 W/m² blue ( 420 nm - 490 nm) 1660 µW/cm² = 16.6 W/m² green ( 490 nm - 575 nm) 1850 µW/cm² = 18.5 W/m² yellow ( 575 nm - 585 nm) 201 µW/cm² = 2.01 W/m² orange ( 585 nm - 650 nm) 1030 µW/cm² = 10.3 W/m² red ( 650 nm - 780 nm) 1520 µW/cm² = 15.2 W/m² IRA ( 700 nm - 1400 nm) 2040 µW/cm² = 20.4 W/m² IRB ( 1400 nm - 3000 nm) 0 µW/cm² = 0 W/m²
Actionspectra
Erythema 7.03 UV-Index Pyrimidine dimerization of DNA 29.1 µW/cm² Photoceratitis 10.5 µW/cm² Photoconjunctivitis 0.472 µW/cm² DNA Damage 1.65 Vitamin D3 22.7 µW/cm² Photosynthesis 4150 µW/cm² Luminosity 15700 lx Human L-Cone 2310 µW/cm² Human M-Cone 2040 µW/cm² Human S-Cone 1370 µW/cm² CIE X 2010 µW/cm² CIE Y 2180 µW/cm² CIE Z 2490 µW/cm² PAR 27300000 mol photons Extinction preD3 104 e-3*m²/mol Extinction Tachysterol 392 e-3*m²/mol Exctincition PreD3 56900 m²/mol Extinction Lumisterol 46.1 m²/mol Exctincition Tachysterol 549000 m²/mol Extinction 7DHC 60.4 m²/mol L-Cone 1900 µW/cm² M-Cone 2240 µW/cm² S-Cone 2360 µW/cm² U-Cone 2020 µW/cm² UVR - ICNIRP 2004 7.92 Rel Biol Eff Melatonin Supression 2050 µW/cm² Blue Light Hazard 1630 µW/cm² (104 µW/cm² per 1000 lx) CIE 174:2006 PreVit D3 24.1 µW/cm² Lumen Reptil 18800 "pseudo-lx" Vitamin D3 Degradation 15.7 µW/cm² Actinic UV 7.83 µW/cm² (4.98 mW/klm) Exctincition Lumisterol 56200 m²/mol Exctincition 7DHC 71300 m²/mol Exctincition Toxisterols 7310 m²/mol
Broadbandmeters
Solarmeter 6.2 (UVB, pre 2010) 84.3 µW/cm² Solarmeter 6.5 (UV-Index, pre 2010) 6.73 Leybold UVB 57.2 µW/cm² Leybold UVA 536 µW/cm² Leybold UVC 0.0445 µW/cm² DeltaOhm UVB 122 µW/cm² DeltaOhm UVC 16.1 µW/cm² Vernier UVB 27 µW/cm² Vernier UVA 339 µW/cm² Gröbel UVA 585 µW/cm² Gröbel UVB 37.7 µW/cm² Gröbel UVC 0.0015 µW/cm² Solarmeter 6.4 (D3) 21 IU/min UVX-31 155 µW/cm² IL UVB 0.0392 µW/cm² IL UVA 649 µW/cm² Solarmeter 6.5 (UVI, post 2010) 4.62 UV-Index Solarmeter 6.2 (UVB, post 2010) 48.7 µW/cm² (Solarmeter Ratio = 10.5) Solarmeter AlGaN 6.5 UVI sensor 41.9 UV Index GenUV 7.1 UV-Index 2.37 UV-Index Solarmeter 10.0 (Global Power) 97.8 W/m² Solarmeter 4.0 (UVA) 11.1 mW/cm² LS122 1.34 W/m² ISM400 82.4 W/m²