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AVAILABLE FROM OCTOBER 2008:
CLEAR MERCURY VAPOUR LAMPS.
Will emit 40-60% more uvA and uvB than standard coated Mercury Vapour Lamps, yet the outer glass envelope still screens out harmful uvC rays.* (See * below)
Currently available in 125W ES fitting only.
To order, e-mail: pwbelg@clara.net or 07792 415 886.
Prices are as follows (+ P&P)
1 lamp £19.95
2 lamps £18.95 ea
3 lamps £17.95 ea
5 lamps £16.95 ea
10 lamps £15.95 ea
P&P = 1 to 3 lamps £3.50
P&P = 5+ lamps £7.95 (includes insurance)
Brand: IWASAKI - Outer glass: Hard
Fitting: ES (E27) 27mm standard thread
Run with any standard 125W MV control gear sets. 230V or generator.
*NOTE: Because of high emissions of UV a & b, skin & eye protection recommended for prolonged exposure or close proximity to these lamps. The same recommendations are made for coated MV lamps and Halide.
FOR U.V. OUTPUT TEST RESULTS - READ BELOW......
To Order: (Within the UK): write sending cheque / P.O. to: Paul W Batty, 50 Burns Road, Dinnington, Sheffield, S25 2LN. England. or paypal to my e-mail a/d (check availability first or your items will be placed on back order).
To check availability Tel: 01909 565 564 or E-mail Paul
TEST RESULTS FOR UV OUTPUT:
Below are readings of relative UVA+B output for an ordinary 125W MV lamp (Sylvania brand) and the Iwasaki H125 Clear 125W MV lamp.
The measurment instrument is a highly accurate
Solarmeter 5.0 which measures combined uvA & uvB with readings in mW / cm². Readings were taken at a standard distance from each lamp and the lamps were driven from the same choke (Parmar 125W) @ 230V, with and without a 10uF capacitor fitted across the choke input, on UK mains supply.
Comparisons: (New Lamps - 5hr burn-in)
Sylvania 125 without cap - 1.9
Iwasaki Clear without cap - 2.9
Sylvania 125 with cap - 2.1
Iwasaki Clear with cap - 3.1
SOME COMPARISONS WITH OLD LAMPS
(hours of use of these lamps not known, but average useage probably in excess of 1 season)
Old Lamp - Sylvania 125 - 1.3
Old Lamp - Philips 125 - 1.5
Old Lamp GE 125 - 1.2
Old Lamp Venture 125 - 1.8
As I get time I will publish UV output results for other size MV lamps and also Actinics and blacks.
Please be careful of making comparisons though between dissimilar lamp or tube types.
A spot reading at the same comparison distance for a 40W Actinic tube is 1.0 mW/cm². Obviously, this should not be compared to the MV lamp readings above, but comparisons with other wattage Actinics or with Black tubes of similar characteristics may be useful. [Paul Batty]
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