Fluorescent Lamps: Arcadia D3+ 12% 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+ 12% 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 refs: BA45, BA47 (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
4.7
3.4
2.6
2.1
1.7
1.4
1.1
0.9
0.8
0.7
Total UVB (W/cm)
161
118
90
70
57
47
38
32
27
24
lux
2,100
1,520
1,190
926
747
612
512
434
370
320
The manufacturer's minimum recommended distance for this tube (with no reflector) is 15cm.
 
Arcadia Electronic Controller - with Arcadia aluminium reflector
UV Index
13.3
9.5
7.0
5.4
4.3
3.5
2.8
2.4
2.0
1.7
Total UVB (W/cm)
479
343
256
197
156
125
104
87
73
63
lux
6,950
5,070
3,820
2,970
2,370
1,900
1,590
1,330
1,150
978
The manufacturer's minimum recommended distance for this tube fitted with this reflector is 20cm. For a brand new lamp, a minimum distance of 25cm may be preferable. (see also the iso-irradiance chart below)
 
Arcadia Pro Vivarium Canopy 24W T5
UV Index
10.1
7.3
5.5
4.3
3.4
2.7
2.4
1.9
1.7
1.4
Total UVB (W/cm)
349
252
190
148
118
97
80
67
58
48
lux
4,790
3,450
2,660
2,080
1,660
1,370
1,150
975
838
720
 
Root-It High-Output T5 Grow Light fixture
UV Index
12.5
10.0
8.0
6.4
5.2
4.3
3.6
3.0
2.6
2.2
Total UVB (W/cm)
437
347
276
222
180
148
124
106
92
80
lux
6,180
5,000
3,990
3,200
2,640
2,180
1,820
1,550
1,360
1,180
 
Sunblaster T5 HO 24in - No reflector fitted
UV Index
4.0
2.9
2.2
1.8
1.4
1.1
0.9
0.8
0.7
0.6
Total UVB (W/cm)
136
100
78
61
49
40
34
28
24
21
lux
2,120
1,600
1,240
1,002
823
680
575
486
418
364
 
Sunblaster T5 HO 24in with Nanotech T5 reflector
UV Index
10.2
7.5
5.7
4.4
3.5
2.9
2.4
2.0
1.7
1.5
Total UVB (W/cm)
360
263
200
157
126
103
85
72
62
54
lux
5,500
4,090
3,160
2,540
2,080
1,690
1,420
1,210
1,032
897

 

Longevity
Decay (reduction in UVI with use)
105 h (10 days normal use) 11%
500 h (1.5 months normal use) 24%
1,000 h (3 months normal use) 30%
2,000 h (6 months normal use) 34%
3,000 h (9 months normal use) 36%
4,000 h (1 year normal use) 48%
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) 8,648K
CRI (Ra) (human eye 90.5

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 reflector:

With the reflector fitted, beneath the lamp at 30cm distance the UVB zone with a gradient from UVI 0.5 at its edge to UVI 5.4 at its centre is an oval approximately 130cm in diameter at its widest point. The "footprint" with a UVI exceeding 4.0 is approximately 25cm wide.

At a distance of 1 metre beneath the lamp, the "footprint" with a UVI exceeding 0.5 is approximately 115cm wide.

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 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 only slightly 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 greater proportion of its UV output is in the shorter wavelengths, hence greater photoreactivity is expected.

 

      

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