[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE Flourescent Lamps, efficiency and temperatures
I previously recalled and stated that PCs are about 35% efficient.
What a generous memory I have. Flourescents generally can convert
about 20% or so of their input energy to visible light. PCs are
probably closer to 25% because the smaller diameter helps to keep
mercury vapor at a higher and more efficient operating temperature.
Some high pressure sodium lamps achieve efficiencies of about 30% or
more, but he spectrum is very very narrow.
In terms of mercury vapor temps, the typical preferred operating range
is 40-80 degrees C or 104 -176 degrees F with the maximum efficiency
usually close to 50 degrees C or roughly 120 degrees F. Above or below
those numbers and the amount of light produced per watt falls off more
than 20% below the maximum possible. Note that, if the gas inside the
bulb is about 120 degrees F, then the glass will probably be a bit
cooler, perhaps as low as 100 degrees, depending on ambient conditions.
The temperature ranges are determined largely by the properties of
Sorry for the earlier misstatement.
Do You Yahoo!?
Get email alerts & NEW webcam video instant messaging with Yahoo! Messenger