IEC 61228:2008

IEC 61228
Edition 2.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fluorescent ultraviolet lamps used for tanning – Measurement and specification
method
Lampes fluorescentes à ultraviolet utilisées pour le bronzage – Méthode de
mesure et de spécification
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IEC 61228
Edition 2.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fluorescent ultraviolet lamps used for tanning – Measurement and specification
method
Lampes fluorescentes à ultraviolet utilisées pour le bronzage – Méthode de
mesure et de spécification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
M
CODE PRIX
ICS 17.240; 29.140.01; 97.170 ISBN 2-8318-9523-5

– 2 – 61228 © IEC:2008
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references .5
3 Terms and definitions .5
4 General test conditions.7
4.1 Ageing.7
4.2 Operating position .7
4.3 Ambient temperature .7
4.4 Test voltage .7
4.5 Ballast.7
5 Test requirements .7
5.1 General .7
5.2 Spectroradiometric measuring system .7
6 Measurement and evaluation procedure .8
6.1 Measurement .8
6.2 Calculation of the total effective UV irradiance .8
6.3 Correction factors.8
7 Lamp specification.9
8 Lamp marking.9

Annex A (normative) Determination of the optimum UV irradiance of fluorescent UV
lamps.11
Annex B (normative) Ultraviolet action spectra.12

Figure B.1 – UV action spectra for erythema and NMSC .12

Table B.1 – Weighting factors S(λ) for the erythema and the NMSC action spectrum .13

61228 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLUORESCENT ULTRAVIOLET LAMPS USED FOR TANNING –
MEASUREMENT AND SPECIFICATION METHOD

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61228 has been prepared by subcommittee 34A: Lamps, of IEC
technical committee 34: Lamps and related equipment.
This second edition cancels and replaces the first edition published in 1993 and its
Amendment 1 (1996). It constitutes a technical revision.
In this second edition, an equivalency code for the lamps in introduced. This equivalency code
characterises the spectral energy distribution and is to be applied when replacing lamps in
tanning equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
34A/1242/FDIS 34A/1266/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – 61228 © IEC:2008
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61228 © IEC:2008 – 5 –
FLUORESCENT ULTRAVIOLET LAMPS USED FOR TANNING –
MEASUREMENT AND SPECIFICATION METHOD

1 Scope
This International Standard describes the method of measuring, evaluating and specifying the
characteristics of fluorescent ultraviolet lamps that are used in appliances for tanning
purposes. It includes specific requirements regarding the marking of such lamps.
These recommendations relate only to type testing.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60050-845:1987, International Electrotechnical Vocabulary (IEV) – Chapter 845: Lighting
IEC 60081, Double-capped fluorescent lamps – Performance specifications
IEC 60901, Single-capped fluorescent lamps – Performance specifications
IEC 60335-2-27, Household and similar electrical appliances – Safety – Part 2-27: Particular
requirements for appliances for skin exposure to ultraviolet and infrared radiation
ClE 63:1984, The spectroradiometric measurement of light sources
IEC 62471, Photobiological safety of lamps and lamp systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
ultraviolet lamp
lamp which radiates especially strongly in the ultraviolet, the visible radiation produced, if any,
not being of direct interest
[IEV 845-07-52]
3.2
fluorescent lamp
discharge lamp of the low-pressure mercury type in which most of the light is emitted by one
or several layers of phosphors excited by the ultraviolet radiation from the discharge
[IEV 845-07-26]
– 6 – 61228 © IEC:2008
3.3
type test
test or a series of tests made on a type test sample for the purpose of checking compliance of
the design of a given product with the requirements of the relevant standard
3.4
spectroradiometer
instrument for measuring radiometric quantities in narrow wavelength intervals over a given
spectral region
[IEV 845-05-07]
3.5
bandwidth at a given wavelength
width at half-amplitude points of the transmittance function of a monochromator (unit: nm)
3.6
spectral
adjective that, when applied to a quantity X pertaining to electromagnetic radiation, indicates:
– either that X is a function of the wavelength λ, symbol: X(λ);
– or that the quantity referred to is the spectral concentration of X, symbol: X = dX/dλ .
λ
X is also a function of λ and in order to stress this it may be written X (λ) without any change
λ λ
of meaning
[IEV 845-01-16]
3.7
irradiance
quotient of the radiant flux dφ incident on an element of the surface containing the point, by
e
the area dA of that element (unit: W/m )
[IEV 845-01-37]
3.8
action spectrum
efficiency of monochromatic radiations for producing a specified phenomenon in a specified
system
[IEV 845-06-14, modified]
3.9
effective
adjective that, when applied to a quantity pertaining to electromagnetic radiation, indicates
that the quantity referred to is weighted according to a specified action spectrum
3.10
nominal value
approximate quantity value used to designate or identify a lamp
3.11
rated value
quantity value for a characteristic of a lamp for specified operating conditions
NOTE The value and/or conditions are specified in this standard, or assigned by the manufacture or responsible
vendor.
61228 © IEC:2008 – 7 –
4 General test conditions
4.1 Ageing
Before the initial measurements, lamps shall be aged for a period of 5 h ± 0,25 h under
normal operating conditions.
4.2 Operating position
During ageing and measurement, lamps shall be operated in a horizontal position. Ageing is
preferably in a horizontal position; a vertical position may also be applied.
4.3 Ambient temperature
The measurement shall be made in a draught-free atmosphere at an ambient temperature of
25 °C ± 1 °C.
NOTE If applicable, lamps may also be measured under conditions different from the above standard ambient
temperature conditions to establish the optimum UV irradiance, as described in Annex A.
4.4 Test voltage
The test voltage applied to the circuit shall be as specified on the relevant lamp data sheet.
4.5 Ballast
Lamps shall be operated with a reference ballast. In cases where a reference ballast has not
been established, an appropriate test ballast shall be specified by the lamp manufacturer or
responsible vendor. The ballast shall be operating at a frequency of 50 – 60 Hz.
5 Test requirements
5.1 General
Spectroradiometric measurements shall be made in accordance with the relevant
recommendations of the CIE (International commission on illumination ), as given in CIE 63.
Additional information about UV measurements is given in Annex B of IEC 62471.
Requirements for electrical measurements are given in Annex B of IEC 60081 and IEC 60901.
5.2 Spectroradiometric measuring system
Lamps shall be measured in an appropriate spectroradiometric system to obtain the spectral
irradiance.
The system input optics shall have cosine response to accurately measure irradiance.
The spectroradiometer shall have a bandwidth not exceeding 2,5 nm.
The distance between detector and lamp axis is not specified but shall be not less than 10 cm.
NOTE 1 For the publication of the final lamp specifications, the measured irradiance values are corrected to
arrive at irradiance values at 25 cm distance from the lamp axis (see 6.3).
NOTE 2 A bandwidth of 1 nm is advisable for greater measurement accuracy in cases where a rapid change of
the spectral irradiance occurs within a small bandwidth area.

– 8 – 61228 © IEC:2008
NOTE 3 The bandwidth should be at least 2,5 times the measurement interval.(e.g. 2,5 nm bandwidth requires
1 nm measurement interval)
6 Measurement and evaluation procedure
6.1 Measurement
The spectral irradiance shall be measured at intervals of 1 nm from 250 nm to 400 nm. Under
the test conditions, the lamp power, current and voltage shall be recorded.
6.2 Calculation of the total effective UV irradiance
The total effective UV irradiance shall be calculated from the spectral irradiance using the
following formula:
E = Σ E . S(λ) . Δλ
eff λ
where
E is the total effective irradiance (W/m );

eff
E is the spectral irradiance (W/(m .nm));
λ
S(λ) is the weighting factor according to the applicable action spectrum;
Δλ  is the wavelength interval (nm).
The wavelength interval for the calculation shall preferably be equal to the bandwidth.
The applicable action spectra for erythema and NMSC are given in Annex B.
For the total effective UV irradiance weighted according to the erythema action spectrum, the
summation shall be performed over the following wavelength range:
250 nm ≤ λ ≤ 400 nm.
For the total effective UV irradiance weighted according to the NMSC action spectrum, the
summation shall be performed over two wavelength ranges:
250 nm ≤ λ ≤ 320 nm, and
320 nm < λ ≤ 400 nm.
NOTE The limit of 320 nm is chosen in accordance with IEC 60335-2-27, where for this application the CIE
nomenclature UV-A and UV-B with a limit of 315 nm is not used.
6.3 Correction factors
In order to arrive at the final total effective UV irradiance values, the following two correction
factors may have to be applied:
a) for lamps having the optimum UV irradiance at an ambient temperature other than 25 °C,
a factor to obtain the optimum UV irradiance, as described in Annex A;
b) for lamps measured at a distance other than 25 cm, a factor to obtain the UV irradiance at
25 cm distance. This geometrical factor can be obtained for each lamp type either
experimentally or by calculation.

61228 © IEC:2008 – 9 –
7 Lamp specification
The following information shall be given for each lamp type in the manufacturers literature:
a) lamp dimensions;
b) for reflector lamps, the reflector angle α, i.e. the angle subtended at the lamp axis by the
reflector coating;
c) the type of ballast for which the lamp is designed;
d) the rated electrical characteristics:
− lamp wattage;
− lamp current;
− lamp voltage;
e) three rated total effective UV irradiance values at 25 cm distance from the lamp axis and
weighted according to Annex B:
− the erythema action spectrum over the wavelength range 250 nm ≤ λ ≤ 400 nm;
− the NMSC action spectrum over the wavelength range 250 nm ≤ λ ≤ 320 nm;
− the NMSC action spectrum over the wavelength range 320 nm < λ ≤ 400 nm.
f) the equivalency code (see Clause 8).
The values under items d) and e) shall be given under conditions of optimum UV irradiance.
The values under item e) shall be given in mW/m and rounded to the nearest integer.
8 Lamp marking
The following information shall be legibly and durably marked on the lamp:
a) the type reference of the lamp, containing:
– a mark of origin (this may take the form of a trade mark, the manufacturer’s name or
the name of the responsible vendor);
– the nominal lamp wattage (marked “W” or “watts”);
– a further identification of the specific lamp type (mostly in the form of a commercial
designation);
b) the equivalency code, in the form: "Wattage–Reflector type code–UV code".
– The wattage in the equivalency code shall be the nominal lamp wattage.
– The following reflector type code shall be used in the equivalency code:
O for non-reflector lamps;
B for lamps with a broad reflector angle α > 230°;
N for lamps with a narrow reflector angle α < 200°;
R for lamps with a regular reflector 200° ≤ α ≤ 230°.

– 10 – 61228 © IEC:2008
– The following UV code shall be used in the equivalency code:
UV code = X/Y
X = total erythema effective UV irradiance over the range 250 nm – 400 nm;
Y = ratio of the NMSC effective UV irradiances ≤ 320 nm and > 320 nm.
X is to be given in mW/m rounded to the nearest integer, Y is to be rounded to the
nearest first decimal. The effective values are at 25 cm distance and under conditions
of optimum UV irradiance.
EXAMPLE
100 W reflector lamp with 220° reflector angle
erythema effective UV irradiance (250 nm – 400 nm) = 47 mW/m
short wave NMSC effective UV irradiance (≤ 320 nm) = 61 mW/m
long wave NMSC effective UV irradiance (> 320 nm) = 19 mW/m
Equivalency code: 100–R–47/3,2

61228 © IEC:2008 – 11 –
Annex A
(normative)
Determination of the optimum UV irradiance of fluorescent UV lamps
Many fluorescent UV lamps for tanning have a very high wall loading. When operated at the
standard ambient temperature of 25 °C, the vapour pressure will be too high and the emitted
UV radiation will be lower than its optimum value. In many appliances, forced cooling is
applied in order to reach optimum conditions for the radiation. The electrical characteristics
and the effective UV irradiance have to be specified under these conditions for optimum UV
irradiance.
To arrive at the values at optimum UV irradiance two methods can be applied:
a) the measurement is made under non-standard ambient conditions to control the vapour
pressure, i.e. by a lower ambient temperature or by local cooling. The conditions to be
applied are dependent on the lamp type and shall be described in the manufacturer’s
documentation.
b) the measurement is made under standard ambient conditions and a correction factor is
applied to the results. This correction factor can be determined for each lamp type from a
continuous plot of the UV irradiance, emitted by the phosphor, during the run-up of the
lamp until a stable situation is reached. From this plot, the maximum value and the value
after stabilisation can be measured. The correction factor to be applied follows from the
quotient of the maximum value by the stabilised value. At the time of maximum UV
irradiance the lamp wattage, current and voltage have to be recorded.
In case of dispute, the second method shall be the reference measuring method.

– 12 – 61228 © IEC:2008
Annex B
(normative)
Ultraviolet action spectra
The UV action spectra to be applied are the erythema and the NMSC (non-melanoma skin
cancer) action spectra, as given in IEC 60335-2-27.
The action spectra are shown graphically in Figure B.1 and the weighting factors S(λ) are
listed in Table B.1.
NOTE The erythema action spectrum is defined from the following parameters:
Wavelength λ Weighting factor S(λ)
(nm)
λ ≤ 298
0,094(298 - )
λ
298 < λ ≤ 328 10
0,015(140 - )
λ
328 < λ ≤ 400 10
Spectrum for non-melanoma
skin cancer
Spectrum for erythema
0,1
0,01
0,001
0,000 1
250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400
Wavelength λ  (nm)
IEC  2351/07
Figure B.1 – UV action spectra for erythema and NMSC

Weighting factor S(λ)
61228 © IEC:2008 – 13 –
Table B.1 – Weighting factors S(λ) for the erythema and the NMSC action spectrum
Wavelength Weighting factor  Wavelength Weighting factor  Wavelength Weighting factor

Erythema NMSC Erythema NMSC Erythema NMSC
nm nm nm
250 1,000000 0,010900 300 0,648634 0,991996 350 0,000708 0,000394
251 1,000000 0,011139 301 0,522396 0,967660 351 0,000684 0,000394
252 1,000000 0,011383 302 0,420727 0,929095 352 0,000661 0,000394
253 1,000000 0,011633 303 0,338844 0,798410 353 0,000638 0,000394
254 1,000000 0,011888 304 0,272898 0,677339 354 0,000617 0,000394
255 1,000000 0,012158 305 0,219786 0,567466 355 0,000596 0,000394
256 1,000000 0,012435 306 0,177011 0,470257 356 0,000575 0,000394
257 1,000000 0,012718 307 0,142561 0,385911 357 0,000556 0,000394
258 1,000000 0,013007 308 0,114815 0,313889 358 0,000537 0,000394
259 1,000000 0,013303 309 0,092469 0,253391 359 0,000519 0,000394
260 1,000000 0,013605 310 0,074473 0,203182 360 0,000501 0,000394
261 1,000000 0,013915 311 0,059979 0,162032 361 0,000484 0,000394
262 1,000000 0,014231 312 0,048306 0,128671 362 0,000468 0,000394
263 1,000000 0,014555 313 0,038905 0,101794 363 0,000452 0,000394
264 1,000000 0,014886 314 0,031333 0,079247 364 0,000437 0,000394
265 1,000000 0,015225 315 0,025235 0,061659 365 0,000422 0,000394
266 1,000000 0,015571 316 0,020324 0,047902 366 0,000407 0,000394
267 1,000000 0,015925 317 0,016368 0,037223 367 0,000394 0,000394
268 1,000000 0,016287 318 0,013183 0,028934 368 0,000380 0,000394
269 1,000000 0,016658 319 0,010617 0,022529 369 0,000367 0,000394
270 1,000000 0,017037 320 0,008551 0,017584 370 0,000355 0,000394
271 1,000000 0,017424 321 0,006887 0,013758 371 0,000343 0,000394
272 1,000000 0,017821 322 0,005546 0,010804 372 0,000331 0,000394
273 1,000000 0,018226 323 0,004467 0,008525 373 0,000320 0,000394
274 1,000000 0,018641 324 0,003597 0,006756 374 0,000309 0,000394
275 1,000000 0,019065 325 0,002897 0,005385 375 0,000299 0,000394
276 1,000000 0,019498 326 0,002333 0,004316 376 0,000288 0,000394
277 1,000000 0,019942 327 0,001879 0,003483 377 0,000279 0,000394
278 1,000000 0,020395 328 0,001514 0,002830 378 0,000269 0,000394
279 1,000000 0,020859 329 0,001462 0,002316 379 0,000260 0,000394
280 1,000000 0,021334 330 0,001413 0,001911 380 0,000251 0,000394
281 1,000000 0,025368 331 0,001365 0,001590 381 0,000243 0,000394
282 1,000000 0,030166 332 0,001318 0,001333 382 0,000234 0,000394
283 1,000000 0,035871 333 0,001274 0,001129 383 0,000226 0,000394
284 1,000000 0,057388 334 0,001230 0,000964 384 0,000219 0,000394
285 1,000000 0,088044 335 0,001189 0,000810 385 0,000211 0,000394
286 1,000000 0,129670
...