Fluorescent Lamps:
ZooMed Reptisun 5.0 UVB T8
 
broadband meter readings  
iso-irradiance charts
spectrum - UV + Visible light
spectral analysis - photobiologically active UV

 

 

 

Lamp index :

Lamp Description

ZooMed Reptisun 5.0 UVB
18watt, 610mm (24in), T8 (diameter 26mm- 1in) fluorescent tube
ZooMed Laboratories, Inc., San Luis Obispo, CA USA

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

Lamp ref: BZ6 & BZ7(2005)

Broadband Meter Readings

 
UV Index (Solarmeter 6.5) Total UVB (Solarmeter 6.2) and Illuminance (Lux meter readings)
New lamp (120hrs use) No reflector fitted                Distance from midpoint of lamp surface (cm)
15
20
25
30
35
40
45
50
55
60
UV Index
0.9
0.7
0.5
0.4
0.3
0.2
0.2
0.2
0.1
0.1
Total UVB (W/cm)
40
30
23
18
15
12
10
9
7
6
lux
1,085
802
616
484
397
325
276
235
202
176

 

Longevity
Decay (reduction in UVB with use)
105 h (10 days normal use) 8%
2,000 h (6 months normal use) 19%
4,000 h (1 year normal use) 33%
8,000 h (2 years normal use) 35%
12,000 h (3 years normal use) 41%
Electrical consumption (includes magnetic ballast) 23 watts
Colorimetry (from spectral data)
CCT (human eye) 7,689K
CRI (Ra) (human eye 87.3

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).
  • low levels of short-wavelength solar UVB (295 - 300nm)
  • high levels of longer-wavelength solar UVB and 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.

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 D3 synthesis, is relatively high.

 

      

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