200/ 220/ 245 High Accuracy Irradiance Standards0 pages

Gooch and Housego offers
1000-W DXW, 200-W, and
45-W lamps as standards
of spectral irradiance, total
irradiance, illuminance, and
color temperature. These
lamps
have
tungsten
coiled-coil
filaments
enclosed in a small quartz
envelope.
The lamp
OL 200 Calibration
standards can be obtained
Standard
with spectral irradiance
calibrations over all or part of the 250 to 2500 nm
wavelength region. In addition, the 1000-W DXW and
200-W lamps can be calibrated out to 4500 nm.

The spectral irradiance
standards issued by Gooch
and Housego are based on
the National Institute of
Standards and Technology
(NIST) Spectral Irradiance
Scale for the wavelength
range of 250 to 2400 nm
and on a blackbody for the
wavelength range above
OL 220 Calibration
2400 nm. The NIST Scale
Standard
has an uncertainty (k=2) of
0.63% in the visible, 1.56%
in the ultraviolet at 250 nm, and 0.31% in the infrared at
2000 nm.

OL 200, OL 220, and OL 245
High-Accuracy Irradiance
Standards
PERFORMANCE SPECIFICATIONS
1000-W
Spectral Irradiance (nominal) **
@ 250 nm (W/(cm2nm))
@ 1050 nm (W/(cm2nm))
Total Irradiance (nominal mW/cm2)
Illuminance
(nominal footcandles) **

200-W

45-W

2 x 10-8
2.5 x 10-5
30

5 x 10-9
5 x 10-6
6

2 x 10-10
9 x 10-7
1.5

800

170

22

± 1%
± 0.5%
± 1%

± 1-1.5%
± 0.5%
± 1%

± 1-2%
N/A
± 1%

≤ ± 0.06%
/ hr

≤ ± 0.06%
/ hr

< ± 0.06%
/ hr

8.000

6.500

6.500

Transfer Uncertainty *
High-Accuracy
Super High-Accuracy
Uncertainty * - Illuminance
Long Term Photometric Stability
Operating Current (amps DC)
*Uncertainty is relative to NIST Scale at k=2
**Measured at 50 cm

CALIBRATION OPTIONS
1000-W

200-W

45-W

Spectral Irradiance:
250 - 750 nm

OL 200A

OL 220A

OL 245A

750 - 2500 nm

OL 200B

OL 220B

OL 245B

250 - 2500 nm

OL 200C

OL 220C

OL 245C

250 - 1100 nm

OL 200M

OL 220M

OL 245M
OL 245V

380 - 780 nm

Calibration of the 1000-W
DXW and 200-W lamps over
the wavelength range of 250
to 2400 nm are available with
two levels of accuracy: highaccuracy and super highaccuracy. The High-Accuracy
Standards
of
Spectral
Irradiance issued by Gooch
and Housego have a transfer
OL 245 Calibration
uncertainty (k=2) relative to
Standard
the NIST Scale of ± 1-2%. The
Super High-Accuracy Standards have a transfer uncertainty
relative to the NIST Scale of ± 0.5%.

OL 200V

OL 220V

250 - 4500 nm

OL 200IR

OL 220IR

N/A

Total Irradiance

OL 200D

OL 220D

OL 245D

Total and Full Spectral

OL 200H

OL 220H

OL 245H

Illuminance (only)

OL 200P

OL 220P

OL 245P

Color Temperature (only)

OL 200K

OL 220K

OL 245K

Uncalibrated (seasoned)

OL 200U

OL 220U

OL 245U

For illuminance and/or color temperature calibrations in addition to any of the above
calibrations, add the suffix "P" and/or “K" respectively to the appropriate model number.
For super high-accuracy calibrations (1000-W or 200-W) add the suffix "S" to the appropriate
model number.

OPTIONAL ACCESSORIES
1000-W
200-W
Lamp Holder
OL 56
OL 57W
Adjustable Lamp Holder Mount
OL 63
OL 63
Programmable DC Current Source OL 83A
OL 410

45-W
OL 57
OL 63
OL 410

NOTE: In order to ensure consistent and reliable results, Gooch & Housego (Orlando)
standards should only be used with current sources that possess a ramp current feature.

Contact: orlandosales@goochandhousego.com

www.GHinstruments.com

As part of our policy of continuous product improvement, we reserve the right to change specifications at any time
Bulletin 6 / Rev 9-11
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