|
LiLLighting
Type |
Incandescent
|
Halogen
|
Compact Fluorescent/
Fluorescent
|
LED
|
|
| |
De
Description |
Electrical
current
passes
through
athin
tungsten filament
heating
it
until
it
produces
light.
|
Similar
to
incandescent but
halogen gas
enables it to
operate at
higher temperatures making
it slightly
more energy
efficient.
|
A
tube is coated
with phosphor
salts and
is filled with
a gas containing
low pressure mercury
vapor. A
heated tungsten
cathode then fires off electrons
which react with the phosphors
to create
light.
|
Light
emitting diodes
produce
light through
a solid state process
called electroluminescence.
|
| |
Po
Power Used |
A
60 Watt bulb uses
60 Watts.
|
Approx
50
Watts.
|
15
Watts
About
one-quarter
the
power
of an incandescent bulb.
|
6 Watts
One-tenth
the power of an incandescent bulb.
|
| |
He
Heat
Generated |
The
glass coating of a general service
light
bulb can
reach temperatures of
over 200 degrees Celsius.
Over 95% of energy used is wasted as heat.
|
The
bulb
surface must be
very hot, generally over 250
degrees Celsius.
|
Fluorescent
lights emit around 30% of their
energy output as heat.
|
LED’s
generate a small amount of heat at their
electrical connection (approx 50-60 degrees
Celsius) but the light itself emits no heat
whatsoever.
|
| |
W
Working
Life |
750-1000hrs
|
500-3000hrs
|
Approx
10,000hrs
|
50,000hrs
|
| |
Cost
over
working
liLifefetime
(5 0,
000 hrs)
|
$50
50
Bulbs
|
$35
17
Bulbs
|
$35
5
Bulbs
|
$50
1
Bulb
|
| |
LLLifetime
Running
Cost*
|
$300
|
$250
|
$75
|
$25
|
| |
T
Total
Cost Over LiLifetime |
$350
|
$285
|
$110
|
$75
|
| |
Li
Lifetime Carbon EEEmissions**
|
1,830kg
|
1,525kg
|
457kg
|
183kg
|