PR-655/670 User Manual
81
L
UMINOUS
/
R
ADIANT
F
LUX
Luminous Flux (
given in lumens
) is the basic unit of photometry and is calculated from
Radiant flux
(
given in
watts).
It represents the total luminous or radiant output of a source over 360° and is analogous. Typical
applications for luminous flux measurements include florescent or incandescent lamps and LEDs where it is
required to know the total output of the source.
The correct way to measure luminous (or radiant) flux is by utilizing an integrating sphere. Integrating spheres
possess the ability of (as the name implies) integrating or homogenizing the light over the entire 360° emittance
pattern of the device under test.
For the PR-655 and PR-670, the IS-655 or IS-670 integrating sphere is available for measuring the luminous and
radiant flux of LEDs.
O
VERVIEW
Figure 76 - IS-655 / IS-670 Outer View
The IS-655 / IS-670 is a 3 inch sphere designed to measure the total luminous flux (lumens) or radiant flux
(watts) of LEDs or other small source such as miniature lamps. This accessory consists of a sphere with baffle
and LED Mounting Tube (See Figure 77). During operation, the LED is inserted into the interior end of the
Mounting Tube, the Adjustment Screw is set so that the tip of the LED protrudes precisely 0.100 inches into the
sphere, and the measurement is conducted. The power cables for the LED (plus and minus current) are
connected via mini banana jacks located on the anterior end of the mounting tube.
Содержание PHOTO RESEARCH SpectraScan PR-655
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