bought some LED christmas tree lights this year and paid a lot more for them
than the normal filament bulbs. The filaments magically always fail to come
on the following year despite working fine the previous christmas. How do
they manage that? [ incidentally a japanese engineer told me they are now
making stuff to fail very soon after the one years warranty is up. Also did
you know the British county courts are sympathetic to claims that many
especially expensive items should last for more than one year].
What i am asking here is whether it's possibly true what the shop assistant
told me; that, 1. LED bulbs will last practically forever and, 2. if one
bulb fails the rest will continue to light?
Would any of you really clever people possibly be able to explain simply how
an LED is different from a filament bulb? thanks.
Yup, its true. LED bulbs also use a lot less electricity than
conventional bulbs. In fact, I heard a story on the radio last week that
the efficiency of LED lights is so great that Wal-Mart is phasing out
regular bulbs in all its stores and replacing them with LEDs in order to
save money and create less pollution.
They dont. It you that buggers them up getting them
off the tree with cheap and nasty filament bulbs.
Not even possible.
So are plenty of other small claims systems, particularly
with durable items like cars and fridges etc.
Correct, they're run in parrallel, not in series like the cheap filament bulbs.
Doesnt need anything clever. Filament bulbs are the same as
they have always been, a metal filament that gets hot when on.
LEDs are a semiconductor diode that emits light when electricity
passes thru it. Those small ones dont get anything like as hot as a
filament bulb and so there isnt any intrinsic life limiting effect involved.
In a sterile, benign environment, the LEDs might last that long, but
these are probably in cheap plastic packages. The wires will flex
and break, mechanical stress and temperature variations will break
the plastic seals on the packages and contamination will get in and
destroy the devices.
So unless you're buying LED Christmas lights in a MIL-SPEC package, I doubt
their lifetime will be significantly better than any other kind.
IMO, it's not worth paying a premium over the cost of inexpensive
filament bulbs. I've have several cascadable strings of cheap indoor
lights that have lasted 20 years so far. If a string ever fails
I'll just replace it, but so far, so good.
Well, the LEDs should last a long time (several years), but not forever
since they do get dim over time.
Whether the string goes out when one fails depends upon how they are wired.
If they are in series (a single wire going from one LED to another), a
failure in one will likely cause the rest to go out. LEDs can and do fail
but not often and they don't "burn out" in the usual sense.
What I've noticed is that the LED string sets give less output than even the
mini lamps in the usual string sets. So, it takes more LED lamps to get the
proper lighting effect -- at least on an indoor decorated tree.
Yes, the old series string sets are a nuisance; but I found one of those
little testers (looks like a pen) that isolates the failed bulb or faulty
socket quickly. By the way, I find that poor connections in the socket
cause about as many problems as failed bulbs.
Main difference between an LED and a filament bulb is heat. The filament in
a standard lamp gets so hot that light is produced. The LED transforms
electricy to light inside a crystal using the natural properties of the
materials in just the right way -- no heat required.
I've noticed the opposite - I can't believe how bright the LEDs are! And the
set of 90 I bought are rated at only 4.7 watts.
I also bought my son an LED torch as a stocking filler. It's got 68 LEDs in
it and it's so bright you can't look directly at it.
Good point. Some LED sets, particularly the new ones around this year, are
brighter -- especially the colors like blue and red. I was thinking of some
of the sets with white lamps that didn't have the sparkle or output of the
mini sets. They also have a bluish white color. Some probably like that --
looks like ice and all that; but I find it too cool in appearance.
I surely noticed the green bulbs being many times brighter and a more
pleasant shade of green than in the original LED strings of a few years
ago. The green ones are now fairly close to emerald green, and a few
years ago they were mostly a very yellowish shade that looked yucky when
brightness is low - which it was with the yellowish green ones.
- Don Klipstein ( firstname.lastname@example.org)
The white ones are definitely an "icy blue white". I have a set up next to
some regular white lights which now look pale yellow compared to the LED
ones. IMO the white ones are too much unless interspersed with coloured
ones - but bright they certainly are.
thats depends on how they are connected, if they are connected in parallel
they should continue to work if one fails, if in serial mode, just like
ordinary lights, then the rest wont light up if one fails
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