Fluorescent Lamps: Arcadia Natural Sunlight 2% UVB T8 Reptile Lamp  
broadband meter readings  
iso-irradiance charts
spectrum - UV + Visible light
spectral analysis - photobiologically active UV

 

 

 

Lamp index :

Lamp Description

Arcadia Natural Sunlight 2% UVB T8 Lamp
18watt, 600mm (24in), T8 (diameter 26mm- 1in) fluorescent tube
Arcadia Products plc, Redhill, Surrey, UK

Ballast fixture: standard Arcadia 240v magnetic ballast for 18watt fluorescent tubes
Reflector: Arcadia T8 600mm (24in) aluminium reflector

Lamp ref: BA12 (2008)

Broadband Meter Readings

 
UV Index (Solarmeter 6.5) Total UVB (Solarmeter 6.2) and Illuminance (Lux meter readings)
New lamp (1hr use) No reflector fitted                Distance from midpoint of lamp surface (cm)
15
20
25
30
35
40
45
50
55
60
UV Index
0.4
0.3
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0
Total UVB (W/cm)
19
14
10
8
7
6
4
4
3
3
lux
1,560
1,170
884
696
572
469
394
340
292
255
With Arcadia aluminium reflector
UV Index
0.7
0.5
0.3
0.2
0.2
0.1
0.1
0.1
0.1
0.1
Total UVB (W/cm)
37
27
20
16
12
10
8
7
6
5
lux
4,130
3,000
2,290
1,740
1,400
1,150
940
802
685
592

 

Longevity
no figures available
Electrical consumption (includes magnetic ballast) 24 watts
Colorimetry (from spectral data)
CCT (human eye) 7,216K
CRI (Ra) (human eye 91.0

Iso-Irradiance Charts       
Not prepared for this lamp owing to very low UVB output

Spectrum - UV plus Visible Light

Spectrum - UV in more detail

This spectrum has:

  • no detectable UVC or non-terrestrial UVB (wavelengths below 290nm).
  • low levels of solar UVB (295 - 320nm)
  • moderate levels of short-wavelength UVA (300 - 350nm)
  • low long-wavelength UVA output (wavelengths 350 - 400nm) - reptile vision includes long-wavelength UVA.
  • fairly low but continuous spectrum visible light (wavelengths 400 - 750nm) between the mercury vapour emission "spikes" - this improves colour rendering to the reptile eye - plus triphosphor peaks in blue, green and red wavelengths - this improves colour rendering to the human eye.

Spectral Analysis - photobiologically active UV (wavelengths from 270 - 350nm)

  • There is significant UVB in the wavelengths which enable vitamin D3 synthesis in skin.
  • This lamp emits no hazardous UVC or non-terrestrial UVB (below 290nm).
  • This lamp has a spectrum very much like sunlight, in the UVB region. It emits no significant UVB below 295nm, and only a very small proportion below 300 - 305nm. The risk of DNA damage is therefore very similar to natural sunlight.
  • The proportion of UVA from 320 - 335nm, important for natural prevention of excess vitamin D3 synthesis, is relatively high.

      

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