Bill you are way behind the times on LED tech.
Old school tungsten lamps are 8-20 lumens per watt, as the wattage goes
up so does the lumens per watt up to about 35 for projection lamps.
Halogen lamps are better then the lower wattage bulbs, at 9-25 lumens
per watt.
Compact fluorescents typically have 50-70 lumens per watt
Regular T5 straight Florescent bulbs run 70-105 lumens per watt
Low pressure sodium (yellow street light) have a lumens per watt of ~200,
Currently available White LED's from CREE have a lumens per watt of 260
lumens per watt (this is the LED chip used in the Scurion and other of
the newer caving lamps) and it is now standard for many LED's available
to have lumens per watt in the 100-200 range.
When looking at the costs of replacing a whole system of lamps, the
bulbs efficiency is often the last thing to worry about, wiring costs,
voltage/transformer costs and replacment are bigger factors for the
"average Joe" LED tech is still in a state of rapid development so the
bulbs they would buy today may not be avalable nect year, and many of
the light manufacturing companys have stopped putting money into CFL
development and have instead switched to LED as that is were the future
is in lighting (at least on any commercial scale)
Terry H.
On 7/21/2012 11:50 AM, Mixon Bill wrote:
Halogen lamps are so more efficient than ordinary incandescent lamps,
because they run at a higher temperature and put out more lumens per
watt. Sure, every lamp, even an LED, ultimately creates one watt of heat
per watt of input, but the question is how much of the energy is useful
light on the way to becoming heat.
LEDs aren't as much more efficient than other lights as most people
think. They seem brighter because their output is inherently focused.
They aren't really more efficient than compact fluorescents for area
lighting.
Halogen bulbs might be an inexpensive substitute for ordinary light
bulbs once the clowns in Washington have outlawed the 25-cent kind. --
Mixon
--Mixon
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