How to save electricity?

[atrecord]

limlim:

atrecord:

Actually it's strange, as i remember almost all the lighting shops I went to when scouting for lights for house, told us that LED is not as bright as those normal energy-saving lights, watt for watt. But the difference is not v significant.

atrecord:

[quote=\"Busymom\"]So LED lights good for eyes. Is it more energy-saving than energy saving lights?

Apparently yes, according to what I was told by those selling lights... It's significantly more energy-saving, but LED costs significantly more upfront too. The guys told me will likely breakeven only after a few years of use...

Err... let me try to see if i make sense:

If you use 18W LED vs 18W energy-saving light, the latter is brighter. So you might have to use, say, 22W LED to match up in terms of brightness.

Not sure if this is the way to present it, but the electricity bill spent on the 22W LED is less than the 18W enery-saving one, significantly in terms of percentage. However, since light as a whole, is not all that expensive, the absolute savings is not that much (e.g. if it was originally $0.50, even if you save 20%, the absolute saving is only $0.10)...

And given that the price of LED is much higher than normal energy-saving lights (i think as much as 2x or 3x the price), if the price difference is say, $50 for one light, it will take many years for the electricity bill savings to be more than the $50 you have spent more on the LED...

Does this help?
This 2 statements are contradicting worr..[/quote]

[Busymom]

Thanks limlim and atrecord for the clarification.


If I may ask another stupid question, what kind of light does inverter lamp use? Is it better than LED light for eyes?

[Busymom]

atrecord:

limlim:

[quote=\"Busymom\"]
So LED lights good for eyes. Is it more energy-saving than energy saving lights?

Technically on paper yes lah.. the other time I went to a philips showroom at geylang they also something like 17W LED is as bright as 22W CFL or something like that..

but some folks here feedback that LED of same wattage is less bright.... so.. YMMV lor..

But one thing thou.. LED bulbs are quite directional.. i.e. like a torchlight, they beam forward, unlike CFL which by design can be almost 360deg all round.

So in term of lighting up a big area like a room, the LED may create the impression that it is \"less bright\". But it may in fact be brighter in the area that the beam is targeted at.. so some skillful positioning and orientation maybe recommended. I suspect only lah..

Actually it's strange, as i remember almost all the lighting shops I went to when scouting for lights for house, told us that LED is not as bright as those normal energy-saving lights, watt for watt. But the difference is not v significant.

If not sure about LED, one way is to look straight at the 'bulb'. LED has lots of small light bulbs, each of which is not very/too bright to the eyes. If you have those conventional light bulb, for sure your eyes cannot look straight into the bulb for long.[/quote]Actually I have the impression that LED lights are like indiv small bulbs spread out across a tube.. Am I wrong?

[Nebbermind]

Busymom:

Thanks limlim and atrecord for the clarification.


If I may ask another stupid question, what kind of light does inverter lamp use? Is it better than LED light for eyes?

it's still fluorescent but the operating freq is a lot higher

[Busymom]

atrecord:

Busymom:

This charge is new to me. What happens if I split a bathroom into two units (side by side, one just the shower and vanity top, the other side WC and a sink), would I have to pay for 2 toilets or 1 toilet?

You just have to look at your monthly PUB bill. In it there are different items, some depends on usage (e.g. electricity, water), and some are fixed (e.g. toilets, refuse removal).

I think the charge is to ensure that the water supply to toilet is working, and the drainage pipe from toilet is working. If it was one toilet originally in the location, it should not change - but that's just my view...

I don't look at our PUB bills.. I spend my time on other things... like surfing ksp

There isn't a toilet there initially, so this arguement may not stand. Anyway, hopefully we won't be charged for 2 toilets as the intention is to allow another person to use the WC in case someone is bathing.

[Busymom]

Nebbermind:

Busymom:

Thanks limlim and atrecord for the clarification.


If I may ask another stupid question, what kind of light does inverter lamp use? Is it better than LED light for eyes?

it's still fluorescent but the operating freq is a lot higher

Oh!

So I guess LED is better for eyes? Just like tungsten.

[limlim]

atrecord:

Not sure if this is the way to present it, but the electricity bill spent on the 22W LED is less than the 18W enery-saving one, significantly in terms of percentage. However, since light as a whole, is not all that expensive, the absolute savings is not that much (e.g. if it was originally $0.50, even if you save 20%, the absolute saving is only $0.10)...

That is not correct.

22W means it consumes 22W of power.

18W means it consumes 18W of power.

And one that is rated at higher wattage definitely consume more power than one rated lower = higher electricity bills. This one.. no need to explain..

As simple as that.


Let me explain what is meant by \"energy saving\" lamp..

Traditionally, bulbs are of incandescent type. They pass electricity thru the filament until the filament is heated up so much that they glow red-hot, then almost white-hot. Thus giving out light.

If you use a 80W bulb, it may be bright enuff to illuminate a room.

Now, if you use a 20W FL, it may produce the same amount of illumination as the 80W bulb.

Now, of coz the 20W FL only uses 25% of the consumption of the 80W bulb (20/80 = 25%).

Since the objective is illumination, why waste electricity by using high wattage incandescent bulbs? (when it actually produces more heat than light)

By using FL, you achieve the same illumination with lesser energy consumption. That is why, they are termed \"energy saving\" lamp. When the objective is illumination.

So, either

a) The bulb is MUCH brighter than incandescent bulbs at same wattage, or,

b) the bulb produces the same illumination, but at much lower wattage (power consumption)

Then, they are commonly referred to as \"energy saving\" bulbs.

The wattage refers to the power consumption.. as simple as that.. don't read too much into it......


For some devices, the \"W\" rating may refer to \"output power\" and not consumption, that, is another topic for another day.. as far as most household appliances are concerned, \"W\" refers to power consumption, which can be directly used to calculated electric bill$.

[limlim]

Busymom:

Actually I have the impression that LED lights are like indiv small bulbs spread out across a tube.. Am I wrong?

LEDs are commonly known to look like this

http://reefbuilders.com/files/2012/10/LED.jpg\">


In lamps, they strip off the plastic and the active element looks like this (one single yellow object in the picture)

http://www.ledlightsupplier.com/Led/27pcs-5050-smd-led-g9-light-875S.jpg\">

[CloudeeDaz]

limlim:

If you use a 80W bulb, it may be bright enuff to illuminate a room.

Now, if you use a 20W FL, it may produce the same amount of illumination as the 80W bulb.

paiseh... can i ask how to know whether they give the same illumination? Other than buying it home to try, is it stated on the packaging?

[GLORYmum]

Hi, May I ask since led appears not as bright as FL, how many watts of led is suitable for study table ? I m referring to a long strip led bulb. Tia.