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LIGHTING
OSRAM SYLVANIA, BEVERLY, MASSACHUSETTS
The Jefferson Memorial is showcased
with brilliance and energy efficiency
using HID lamps from OSRAM SYLVANIA.
BY THOMAS D. DREEBEN, OSRAM SYLVANIA
Modeling is being used extensively to
reduce the amount of energy consumed
by lighting. Worldwide, the energy
consumption of lighting is approximately
2800 TWh, 20% of the global supply of
electricity. At a conservative 10 cents
per kWh, the cost of this energy is $280
billion per year. For the light-sources industry,
gross annual income is approximately
$25 billion, one order of magnitude
smaller than the cost of energy used
for lighting. As we pursue reduced energy
consumption in all of our light-source
technologies, we expect to offer global energy
savings that repeatedly offsets the
full cost of operating our industry.
tube made of quartz or ceramic. A 175-W
mercury-filled HID lamp is shown in
Figure 1. Most of the light from a running
HID lamp is emitted from the arc,
which typically reaches temperatures of
5000-6000 K. HID lamps are commonly
used to supply light in expansive spaces
both indoor and outdoor, where they offer
advantages in space efficiency and
energy efficiency.
Arc tube
t Electrode
E e t o e
High-Intensity Discharge Lamps
Research and development of highintensity
discharge (HID) lamps is a key
component of this effort. An HID lamp
works by driving alternating current
between two electrodes to establish an
arc discharge through a gas. The gas
is enclosed in a hermetically-sealed arc
Figure 1. An HID lamp, with the arc tube and one of the two electrodes labeled.
// COMSOL NEWS 2010
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