Fluorescent Lamps:
Arcadia D3+ 12% UVB T8 Reptile Lamp
 
broadband meter readings  
iso-irradiance charts
spectrum - UV + Visible light
spectral analysis - photobiologically active UV

 

 

 

Lamp index :

Lamp Description

Arcadia D3+ 12% UVB T8 Reptile 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: BA15 & BA16 (2008)

Broadband Meter Readings

 
UV Index (Solarmeter 6.5) Total UVB (Solarmeter 6.2) and Illuminance (Lux meter readings)
New lamp (108hrs use) No reflector fitted                Distance from midpoint of lamp surface (cm)
15
20
25
30
35
40
45
50
55
60
UV Index
2.1
1.5
1.2
0.9
0.7
0.6
0.5
0.4
0.3
0.3
Total UVB (W/cm)
61
45
35
28
22
18
16
13
11
10
lux
856
631
485
383
312
263
222
186
162
142
With Arcadia aluminium reflector
UV Index
4.4
3.2
2.5
2.0
1.6
1.3
1.1
0.9
0.8
0.7
Total UVB (W/cm)
135
100
77
61
50
40
34
29
25
21
lux
2,330
1,710
1,330
1,035
843
692
581
494
428
376

 

Longevity
Decay (reduction in UVI with use)
105 h (10 days normal use) 8%
2,000 h (6 months normal use) 29%
4,000 h (1 year normal use) 35%
Electrical consumption (includes magnetic ballast) 26 watts
Colorimetry (from spectral data)
CCT (human eye) 6,688K
CRI (Ra) (human eye 88.0

Iso-Irradiance Charts       
The small tortoise (carapace length 15cm) is drawn to the same scale as the charts and is placed so that its eye level is 30cm beneath each lamp. This is solely to enable comparison between charts, NOT to indicate suitable lamp distances!
NB: To help prevent glare and other eye problems from the visible light, even if UV output appears safe at close range, we also recommend a minimum distance of at least 15cm from all normal-output fluorescent tubes.

Spectrum - UV plus Visible Light

Spectrum - UV in more detail

This spectrum has:

  • no detectable UVC or non-terrestrial UVB (wavelengths below 290nm).
  • high solar UVB and short-wavelength UVA output (wavelengths 290 - 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.

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).
  • Like sunlight, it emits virtually no UVB below 295nm, and very little below 300nm. The risk of DNA damage is therefore little greater than for natural sunlight.
  • The proportion of UVA from 320 - 335nm, important for natural prevention of excessive vitamin D3 synthesis, is relatively high.
  • In comparison with sunlight, a slightly greater proportion of its UV output is in the shorter wavelengths, hence greater photoreactivity is expected.

 

      

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