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OLYMPIC BILI-LITE
Model 33/34 Instruction Manual
1-5
Irradiance
Irradiance
The therapeutic irradiance of phototherapy lights is measured with radiometers,
instruments with optical filters that pass only selected portions of the blue-green
action spectrum of bilirubin. Irradiance (radiant power) is expressed in units of
microwatts per square centimeter per nanometer (µW/cm²/nm).
The Olympic Bili-Meter
1
— the radiometer widely used in nurseries — measures
irradiance from 425 to 475 nanometers (nm). Standard 60601-2-50 of the
International Electrotechnical Commission (IEC) also requires that irradiance from
400 to 550 nm be measured. The following tables show this data.
The irradiance data for the Olympic Bili-Lite Model 33/34, below, is shown for
Olympic Blue (Type OB) and Super Blue (Special, Type BB) blue fluorescent
bulbs at varying distances. Average irradiance is measured over an effective
surface area of 12 x 24 in. (30 x 60 cm). Maximum irradiance is measured at the
center of the area.
1. Each Olympic Bili-Meter is certified to be calibrated traceable to the United States National
Institute of Standards and Technology (NIST).
NOTE
#
The differences between the Olympic Bili-Meter and the IEC measurements do not
represent a difference in the
total
irradiance output of the same bulbs. The difference
results from
averaging
the irradiance of the same bulbs over wavelength bands of different
widths. The Olympic Bili-Meter measures from 425 to 475 nm — nearly all of the irradiance
of blue bulbs occur in this 50-nm band. The IEC measures irradiance from 400 to
550 nm — a 150-nm band; therefore, the
average irradiance per nanometer
of the IEC
measurement will differ from the Bili-Meter measurement.
Table 1.3
Average irradiance using the Olympic Bili-Meter (425–475 nm )
Distance—bulb shield to top of light sensor
20 in.
(51 cm)
25 in.
(64 cm)
30 in.
(76 cm)
(8) Olympic Blue (Type OB) bulbs
11.9
8.5
6.0
(8) Super Blue (Type BB) bulbs
22.4
16.3
12.3
Table 1.4
Maximum irradiance using the Olympic Bili-Meter (425–475 nm )
Distance—bulb shield to top of light sensor
20 in.
(51 cm)
25 in.
(64 cm)
30 in.
(76 cm)
(8) Olympic Blue (Type OB) bulbs
13.8
9.5
6.4
(8) Super Blue (Type BB) bulbs
26.0
18.2
13.3
Содержание BILI-LITE 33
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Страница 26: ...3 4 OLYMPIC BILI LITE Model 33 34 Instruction Manual Operating the Bili Lite ...
Страница 54: ...8 6 OLYMPIC BILI LITE Model 33 34 Instruction Manual Electromagnetic Specifications Manufacturer s Declaration ...