First in Full Range PDA Spectrometer, Spectroradiometer and Spectrophotometer Systems
1 Canal Street  ◊  Unit B1
Lawrence, MA 01840  USA
Tel: 978 687-1833  ◊  Fax: 978 945-0372

Copyright © 2012 Spectral Evolution, Inc
The SR-1901PT is designed  for validating the output of pulsed solar simulators. The system is
especially well-suited for testing the power ratings of photovoltaic modules and solar panels. All
systems come with the subroutines necessary to generate high quality solar spectra and
spectral matching reports.
Research on plant growth done in a climate controlled chamber
or a greenhouse setting can use a wide range of light sources,
including LED, UV, High Pressure Sodium (HPS), and more. When
selecting your light source you need to evaluate any effect the
source you choose may have on your plant growth and research.

With an
SR-1901 or SR-500 portable spectroradiometer, you can
measure the effect of different light sources and compare the
results to natural lighting - sunlight.

Photosynthetic response in plants correlates to a measure of the
radiant power of the light source. Photosynthetically active
radiation (PAR) is defined by photons in flux and measured in
moile/square meter/second.

The SR-1901 and SR-500 spectroradiometers from Spectral
Evolution can be used to measure PAR. A typical configuration
could include an SR-1901 with a fixed 1.2 meter fiber and a right
angle diffuser that is calibrated to NIST standards. The SR-1901
collects high resolution scxans of the light sources you wish to

Our DARWin SP Data Acquisition  software is included with every
instrument and provides access to 19 vegetation indices via a
pull down menu. One of these indices is for PAR. This capability
recalculates the light output in micromole/m2/second. An energy
integration function allows the SR-1901 to output total integrated
power from any selectable range between 280 and 1900nm.

The SR-1901 has a spectral range from 280-1900nm. The SR-500
for budget conscious applications has a 400-700nm spectral
range using a single 512-element UV -enhanced silicon array
DARWin SP Data Acquisition software is included with every spectrometer and spectroradiometer. DARWin
includes a pulldown menu for access to 19 vegetation indices including PAR.
Using a portable spectroradiometer for evaluating
greenhouse light sources and vegetation growth