Fluorescent Lamps: Arcadia D3 6% UVB T5 Reptile Lamp
broadband meter readings
iso-irradiance charts
spectrum - UV + Visible light
spectral analysis - photobiologically active UV

 

 

 

Lamp index :

Lamp Description

Arcadia D3 6% UVB T5 Reptile Lamp
24watt, 550mm (22in), T5 (diameter 16mm) fluorescent tube
Arcadia Products plc, Redhill, Surrey, UK

Ballast fixture: Arcadia 240v Electronic Controller for T5 24-39W fluorescent tubes
Reflector: Arcadia T5 550mm (22in) aluminium reflector
Different reflectors will affect the irradiance profoundly. Additional tests using the following fixtures and reflectors were therefore carried out:
Arcadia Pro Vivarium Canopy 24W T5
Root-It High-Output T5 Grow Light fixture - Small (24watt, 66.5cm) (HydroGarden UK, Coventry, UK)
Sunblaster T5 HO 24in fixture with/without Sunblaster Nanotech T5 reflector (Future Harvest Development Europe, Tyne and Wear, UK)

Lamp ref: BA43 (2011)

Broadband Meter Readings

 
UV Index (Solarmeter 6.5) Total UVB (Solarmeter 6.2) and Illuminance (Lux meter readings)
New lamp (112hrs use)                Distance from midpoint of lamp surface (cm)
15
20
25
30
35
40
45
50
55
60
Arcadia Electronic Controller - No reflector fitted
UV Index
2.4
1.8
1.4
1.1
0.8
0.7
0.6
0.5
0.4
0.3
Total UVB (W/cm)
74
54
41
32
26
21
18
15
12
11
lux
2,750
2,020
1,530
1,220
987
806
673
573
492
424
 
Arcadia Electronic Controller - with Arcadia aluminium T5 strip reflector
UV Index
7.9
5.6
4.3
3.3
2.6
2.1
1.7
1.4
1.2
1.0
Total UVB (W/cm)
240
174
130
101
80
65
53
45
37
32
lux
9,200
6,710
5,130
4,020
3,220
2,660
2,230
1,850
1,580
1,380
The manufacturer's minimum recommended distance for this tube fitted with this reflector is 10cm. At 10cm, UVI 11.7 was recorded, a minimum distance of 15cm is thus suggested.
 
Arcadia Pro Vivarium Canopy 24W T5
UV Index
5.9
4.2
3.2
2.4
2.0
1.6
1.3
1.1
0.9
0.7
Total UVB (W/cm)
185
134
101
78
62
50
41
35
30
25
lux
6,390
4,650
3,540
2,810
2,260
1,850
1,550
1,330
1,140
950
 
Root-It High-Output T5 Grow Light fixture
UV Index
7.7
5.9
4.6
3.7
3.0
2.4
2.1
1.7
1.5
1.2
Total UVB (W/cm)
235
182
142
112
91
75
63
53
45
40
lux
8,800
6,930
5,420
4,310
3,500
2,930
2,460
2,120
1,800
1,560
 
Sunblaster T5 HO 24in - No reflector fitted
UV Index
2.3
1.7
1.3
1.1
0.8
0.7
0.6
0.4
0.4
0.3
Total UVB (W/cm)
72
53
41
32
26
22
18
15
12
11
lux
2,920
2,230
1,760
1,420
1,159
960
808
685
584
504
 
Sunblaster T5 HO 24in with Nanotech T5 reflector
UV Index
5.5
4.0
3.1
2.4
1.9
1.6
1.3
1.1
0.9
0.8
Total UVB (W/cm)
172
126
97
76
61
50
41
35
29
26
lux
7,140
5,240
4,030
3,200
2,630
2,180
1,800
1,550
1,340
1,190

 

Longevity
Decay (reduction in UVI with use)
105 h (10 days normal use) 9%
no further data available
Electrical consumption (includes ballast)
Arcadia T5 Electronic Controller 24 watts
Arcadia Canopy 20 watts
Root-It Fixture 22 watts
Sunblaster Fixture 21 watts
Colorimetry (from spectral data)
CCT (human eye) 8,500K
CRI (Ra) (human eye 93.4

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.

No reflector fitted:

With Arcadia aluminium T5 strip reflector:

 

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.
  • moderate visible light output (wavelengths 400 - 750nm) between the mercury vapour emission "spikes", with a relatively discontinuous spectrum developed for good human 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 excess 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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