IEC 61228 pdf – Fluorescent ultraviolet lamps used for tanning – Measurement and specification method
Lamps shall be operated with a ballast that generates electrical values for the operation of the
respective lamp that match the values given by the corresponding lamp manufacturer orresponsible vendor.
The ballast shall be operated at a frequency of 50 Hz or 60 Hz.The frequency shall be specifiedfor each measurement.
Spectroradiometric measurements shall be made in accordance withthe relevantrecommendations of the CIE (International commission on illumination), as given in CIE63.
NOTE 1 Additional information about UV measurements is given in Annex B of EC 624712006.
NOTE 2 Additional requlrements for electrical measurements are glven in Annex B of lEC 60081:1997，Annex B ofIEC60081:-1997AMD2:2003， Annex B of lEC 60081:1987IAMD4-2010,Annex B of IEC 60081:1997IAMD5:2013 andAnnex B of lEC 609011996，Annex B of lEC 60901-1996/AMD2-2000, Anmex B of lIEC G0901-1996(AMD5:2011 andAnnex B of IEC 60901:1996iAMD6.2014。
5.2Spectroradiometric measuring system
Lamps shall be measured in a spectroradiometer system to obtain the spectral irradiance.The system input optics shall have a cosine response to accurately measure irradiance.
The spectroradiometer shall have a bandwidth at a given wavelength not exceeding 2,5 nm andits wavelength resolution shall not be higher than 1 nm.
The distance between sensor and lamp axis, Dsensor, shall be (25 ± 0.5) cm (see Figure 1).
NOTEA bandwidth at a given wavelength of 1 nm is preferred for greater measurement accuracy in cases where arapid changa of the spactralirradiance occurs within a small bandwidth area.
6Measurement and evaluation procedure
The spectral irradiance shall be measured at intervals of 1 nm from 250 nm to 400 nm. Underthe test conditions, the lamp power, current and voltage shall be recorded. The lamp shall bein stable electric and radiometric conditions.
6.1.2Double capped fluorescent Uv Lamps
Double capped UV fluorescent lamps shall be operated during measurement such that the lampaxis is at the same height as the centre of the entrance aperture of the sensor. The sensor shallbe placed in front of the middle of the lamp (see Figure 1).
Reflector lamps shall be operated such that the non-reflecting side is directed towards theentrance aperture of the spectroradiometer. Lamps having a portion with no phosphor layershall be positioned, such that the uncoated portion is directed centrally towards the entranceaperture of the spectroradiometer.
6.1.3Single capped fluorescent Uv Lamps
Single capped UV fluorescent lamps shall be operated during measurement such that themiddle of the lamp bulb is at the same height as the centre of the entrance aperture of thesensor.
Single capped UV fluorescent lamps shall be operated during measurement such that bothlimbs have the same distance to the centre of the entrance aperture of the spectroradiometer
(see 4.2 and Figure 1).
For single capped fluorescent UV lamps having more than two limbs, the measurement position
that results in the highest measured erythema effective irradiance shall be specified by themanufacturer or responsible vendor.
6.2Calculation of the total effective Uv irradiance
The total effective UV irradiance shall be calculated from the spectral irradiance using thefollowing formula:
Eeff= E·s()· Aa
is the total effective irradiance (W/m 2);
is the spectral irradiance (wi(m2 – nm));
S(0)is the weighting factor according to the applicable action spectrum;Ais the wavelength interval (nm).
The wavelength interval for the calculation shall be 1 nm.
The applicable action spectra for erythema and non-melanoma skin cancer (NMSC) are givenin Annex B.
For the total effective UV irradiance weighted according to the erythema action spectrum, thesummation shall be performed over the following wavelength range: 250 nms a.≤400 nm.