per square meter (W/m ). The reference standard condition is 1 Sun and is equal to 1000 Watts
Relative Lighting Power Density
The figure above compares relative power density for various lighting conditions in units of Watts
2
per square meter of sunlight irradiance at a constant 25°C cell temperature and at 1.5 Air Mass
(Air Mass stands for a well defined light spectrum which appears if the sunlight goes through the
earth’s athmosphere at a defined angle).
As the chart clearly shows, the power density of typical indoor lighting is dramatically lower than
that of sunlight. Not only is irradiance from indirect and artificial light lower; the spectrum is also
narrower. In typical Office Space lighting with a spectrum produced from incandescent or halogen
light bulbs, the power output may be roughly 100 times less than bright sunlight. It may be 200
to 500 times less with fluorescent lighting due to the further limited spectrum.
IXYS makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the
right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses or indemnity are
expressed or implied. Except as set forth in IXYS’ Standard Terms and Conditions of Sale, IXYS assumes no liability whatsoever, and disclaims
any express or implied warranty relating to its products, including, but not limited to, the implied warranty of merchantability, fitness for a particular
purpose, or infringement of any intellectual property right.
The products described in this document are not designed, intended, authorized, or warranted for use as components in systems intended for
surgical implant into the body, or in other applications intended to support or sustain life, or where malfunction of IXYS’ product may result in direct
physical harm, injury, or death to a person or severe property or environmental damage. IXYS reserves the right to discontinue or make changes to
its products at any time without notice.
IXYS reserves the right to change limits, test conditions and dimensions
? 2010 IXYS All rights reserved
IXYS KOREA LTD.
906-5 Iui-dong, Yeongtong-Gu, Suwon, Gyeonggi-Do (Korea)
Phone +82-31-888-5232, Fax +82-31-888-5233
6
Rev.Mar. 2012
IXYS Corporation
1590 Buckeye Drive, Milpitas, CA 95035-7418
Phone (408) 457-9000, Fax 408-496-0670
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