Comments on: Cheaper LEDs to light a green path?

Using plastic could help light-emitting diodes sell for less and compete with power-hungry traditional bulbs, company says.

[Sparky672]

They need to be more careful with these numbers.

It's true that 95% of the energy that goes into a light bulb is
converted to heat. To arbitrarily consider it wasted is foolish.
Remember that in the colder climates, few people would
consider that heat as waste.

Whatever exact amount of energy would have been "wasted" as
heat from light bulbs must now be generated in your furnace or
boiler.

Then in the warmer climates, you'd have to compensate with
additional air conditioning if you're using conventional bulbs.

Perhaps it's a wash overall if you have equal cooling and heating
months in your locality.

You just need to be more careful when you label the heat from
light bulbs as wasted energy. Not everyone lives in California.

[WebmasterOfWarStoke.com]

heat? a waste?

well i agree in part
i personally have a pet turtle and i think he would be rather unhappy if i replaced his lamp with an led lol
but when it comes to my personal lighting i have a floressant lamp and a led one

[jack_ryan]

Saving energy through LEDs

Hello,

to steer the discussion into a more fruitful direction, we should note down, that by replacing incandescent bulbs with LEDs, energy is saved if and only if:

You have it in a place, where only light, but not heat is needed, which means:

1. All outdoor lighting
2. Indoor lighting at elevated outside temperatures

Additionally, the higher lifespan of LED's , which is up to 60-fold that of an incandescent lamp, reduces litter and saves time and effort to replace it as well as it eliminates downtimes without light.
Furthermore the more evenly distributed wavelength spectrum of LEDs is not so depressing (in my opinion) than high red wavelength fraction light of incandescents.

[laremiller]

But many of those incandescant bulbs

are in ceiling fixtures, and thus are providing heat primarily to the portion of the room close to the ceiling -- not to the real-world living area. So most of that heat is wasted, absent well-positioned ceiling fans or some other air redistribution system which will of course use additional electricity.

[Sparky672]

don't neglect convectional air flow

Unless you have little exhaust vents up there, the fact that the
bulbs are near the ceiling will make little difference.

The ceiling might not be the ideal placement for a heat source,
however, warm air will still rise and displace cooler air via some
amount of convection.

So without the hot incandescent light bulbs in ceiling fixtures,
what have you left? Cold air near the ceiling? Nope. The
warmer air in the room will always rise to the ceiling regardless
of what's up there. Without the incandescent bulbs, the average
temperature of the room will be a little lower.

Hey, I'm not knocking the new LED lights... I'd love to use them
during warmer weather.

Just making a point that the energy savings for certain people
during certain times of the year is not what it seems.

[vhallman]

Energy Savings

Wow...Where do I start? AWESOME!! As to the other posters about incandescent vs. LED the TCO (Total Cost of Ownership) for LED lighting is incredibly lower than incandescent OR flourescent bulbs. btw, Cyberlux is a public company and I will be buying a lot of their stock!!

[ArtInvent]

LED light color still needs much improvement

I am a huge fan of LED lighting. Incredible energy efficiency and bulbs that never burn out, what's not to like? Well, how about so-called 'white' LED's that are an extremely blue version of white. The human eye prefers a relatively warm light with a well balanced spectrum so that all colors are equally illuminated. White LED's cast a horrible light color, glaring to the eye, even worse than fluorescents. Fluorescents themselves have improved in this regard, but they still don't hold a candle to halogen or even a good old incandescent, yet fluorescents are still not selling well even while being huge energy savers. Also, fluorescents are not dimmable. When the LED makers have a light with the beautiful warm spectrum of halogen that is dimmable, they will sell like hotcakes. Until then, all the cost cutting in the world will not make much difference in the general lighting market.

[coryschulz]

Actually...

I very much enjoy the bright blueish white light that comes from LEDs. As a painter I think it helps brighten up rooms and lets me see the real colors of the paints I am using. I don't like the mucky yellow glow of regular bulbs. The light they give off feels dirty.

[WhyaDuck]

There are dimmable flourescents

Just as a point of clarification - there are dimmable compact
fluorescent bulbs on the market. I have been using several CFCs
in my house in areas where they can be left on for several hours
at a time - e.g. outdoors lighting, hallways etc. The energy
savings are amazing and the bulbs themselves last for around
10,000 hours. However, I agree that they are not yet suitable for
all applications. The prospect of super bright LEDs is very
exciting. The bulbs should never burn out and their energy
consumption will be very low. At this time I have several LED
flashlights. The light they emit is rather bluish. I imagine that
within a few years LED technology will advance to the point
where they will be suitable for home use.

[grbradsk]

RE: LED light color still needs much improvement

The problem isn't just that white LEDs have a garish blue to them. It's also very monochromatic light -- even with the phosphor. It's still almost laser like in the purity of frequencies. This too is straining for human eyes and color receptors. They need not only a shift to yellow, but a broadening of the spectrum.

Still, I eagerly products and advances in this area.

[Sir Limey]

Energy Savings??

Seems everyone jumped onto the bandwagon on saving s between LED and Incandescent but forgot to look at the original math. If it cost $5 to make the LED and $10 in parts to control it how long would I need to use it to be cost effective compared to my long life flurescent? How can they sell LED flashlights for $3 if the parts cost $15? Think about it before you comment.