Air condition is far more inefficient than all the globe's incadescent
lights put together.If you want to save, use a fan instead.I do, even when
temperature exceeds 95 degrees.LEDs are semiconductors, are very efficient
since they don't emit heat and have a very long life.
You haven't seen a LED of any size.
A luxeon star requires a good heat sink or it will fry it's self.
They have the best efficiency of any white LED, but they still don't match
fluorescents lights..
LED lights usually run 5 lumen/watt, for the normal ones to 25 lumen/watt
for the big $$$ ones.
(Some of the newest $$$$ white LED's are close to 35 lumen watt.)
Most incandescent lights runs about 10 to 25 lumen/watt. (10W vacuum to 400W
halogen )
So, unless you are using the most modern, and expensive LED, your light will
produce about the same amount of heat, for the same amount of light that an
incandescent will produce. The only type of incandescent a LED can replace
with good savings is a flashlight bulb. They usually run 0.5 to 5 lumen/watt
Mercury vapor lights run from 35 lumen per watt for 50W lights, up to 60
lumens per watt for 1000W lights.
It's low end is the top end of an LED's range.
Metal halide runs from 50 lumens-watt for 50W slow start to 125 lumen/watt
for instant start 1000W+ lights
Fluorescent lights usually runs around 60 to 100 lumen/watt.
(Some high output fluorescent lights are up to 150+ lumen watt.)
More than four times the light than LED's make per watt.
High pressure sodium runs about 76 lumens/watt for 50W to 150 lumens per
watt for 1000W.
Low pressure sodium runs about 100 lumens per watt to 175 lumens per watt.
But I favor low voltage halogen because that allows the
use
Why are lower wattage bulbs inefficient?Here, the lowest wattage
incadescent
bulbs are 25 W, and are moderately warm even after hours.So, I should use
an
150 W bulb, when a 60 W is bright enough?That doesn't make any sense.
You are twisting my words.
He mentioned using multiple low wattage lights instead of one big light.
If you don't need the light produced by that one big light, then you should
use a smaller light.
But you shouldn't use multiple smaller lights to replace the brightness of
one big one.
Metal halide lamps use a high voltage of 3.5 kV which is very dangerous to
non-qualified persons and are a real energy catastrophe since their lowest
wattage is 150 W.
Standard halide light sizes 50,70,100,150,175,250,400,1000
The local home depot, menards, and lowes stocks all sizes. From 50W, to
1000W
If your local hardware store doesn't have them, find a store that does.
There is two types of Metal halide lights. The slow start, which has a
starting system basically identical to mercury vapor lights, with same
voltages and everything. That is the original type of metal halide light. It
is basically identical in construction to a mercury vapor light, but with
the added halides in the arc tube. Starting voltages are around 200V to 300V
and running voltage is around 100V. They are so close than you can sometimes
put a metal halide bulb in a mercury vapor fixture and it will work. Bulb
life may suck though.
The second type is the instant start with no starting electrodes in the arc
tube. It basically relies on an electronic starter to produce a 1 to 4KV
voltage spike to initiate the ark, and then the ark voltage drops down to
100 or so volts.
The only downside of metal halide light is their life span. A mercury vapor
bulb usually has a reliable life span of 10+ years. Metal halide lights,
even though they are basically the same construction, have a usable life of
only about 2 years. The added halides deteriorate the arc tube quicker. If
you look at an old metal halide light, the ark tube will be solid black. And
that blackening blocks so much light, that the bulb basically has to be
replaced.
The MH lights have an outer tube of quartz which is almost diamond hard
and
impossible to break with e.g. a hammer.
Metal halide lights have the same quartz glass ark tube that mercury vapor
lights have.
If you are thinking of solid crystal quartz ark tubes, then you are thinking
of high/low pressure sodium lights. They are the types of high energy
discharge
light that uses solid quartz ark tubes.