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How much does it cost to run an energy saving bulb?
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# 1
spinningsheep
Old 08-02-2009, 6:10 PM
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Default How much does it cost to run an energy saving bulb?

I cant seem to find the right figures online, and i know it will vary depending on the actual wattage, but im just curious what the AVERAGE cost would be. My housemate has her light on in her room an average of about 15 hours a day you see. Im on BG CLICK ONLINE 6 and I doubt it is much, but be nice to know.
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# 2
KimYeovil
Old 08-02-2009, 6:18 PM
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Well, they're about 8 to 11 watts. So in 1 hour they use 11/1000 watts or 0.011 watts. 1 kWh costs between 10p and 15p. So (at 12p per unit) that's .132p per hour or 1.3p per 10 hours or 2p per 15 hours.

Cost per hour: (watts / 1000) x Tier 2 unit cost

(So doing that 30 days a month would cost 59.4p compared to the 5.40 a 100W incandescent costs.)

Last edited by KimYeovil; 08-02-2009 at 6:27 PM.
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# 3
spinningsheep
Old 08-02-2009, 6:53 PM
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cheers, no need to panic then!!
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# 4
Sirbendy
Old 08-02-2009, 6:57 PM
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indeed. Somewhere I had the figures worked out for ours, along with all the household appliances. I think they're on my old webhost though. It's not much at all to run a CFL.

EDIT: Nope, can't find it. Did find my calculation of 1.3p/hour to run this PC though. I forgot that!

Last edited by Sirbendy; 08-02-2009 at 7:01 PM.
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# 5
Poppy9
Old 08-02-2009, 7:01 PM
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Does anyone get the flickering and dimness when you first switch on ES Lightbulbs?

The two I have upstairs (both 11w) from Tesco work fine but the downstairs one which is a phillips flickers and is dimmer.
~Laugh and the world laughs with you, weep and you weep alone.~
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# 6
caveman38
Old 08-02-2009, 7:22 PM
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Yes, I do. I was fortunate to be given a load of these in various wattages. I thought that I would use them in places where they would not look too hideous ie. not in the lounge chandeliers.
I installed them in the hall and landing. they get a lot of use and with 2 X 3 bulbs each I would save a few bob each quarter.
Problem was, when I turned the lights off they would continue to pulse on and off. the reason for this I found out was that I had electronic timers installed in the switches for when I'm out late or on holidays as a security measure.
It appears that you cannot use these bulbs with dimmers or timers as there is always residual current. although it is always there it is not sufficient to power a incandescent bulb, but will power a energy one.
My bulbs were then removed and remain redundant. I have been told that I can buy low energy bulbs for dimmers / timers but they cost a few quid each.
Any further thoughts.
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# 7
Freddie_Snowbits
Old 08-02-2009, 7:24 PM
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Quote:
Originally Posted by KimYeovil View Post
Well, they're about 8 to 11 watts. So in 1 hour they use 11/1000 watts or 0.011 watts. 1 kWh costs between 10p and 15p. So (at 12p per unit) that's .132p per hour or 1.3p per 10 hours or 2p per 15 hours.

Cost per hour: (watts / 1000) x Tier 2 unit cost

(So doing that 30 days a month would cost 59.4p compared to the 5.40 a 100W incandescent costs.)
Another point to note is that the Incandescent lamp would also produce 10 x (100-11) x 30 27kw of heat during the same period, and this would reduce your gas cost by (using SP online at 4.52p per kW) by 1.20 in the same period.

And before we get all ultra pendantic LIGHT is HEAT!

(Oh, and the Energy saving version does contain mercury in a vapour format, and should be handled with respect. If broken, it should be cleared up accordingly)

http://www.hse.gov.uk/pubns/mdhs/pdfs/mdhs16-2.pdf
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# 8
Cardew
Old 08-02-2009, 8:39 PM
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Quote:
Originally Posted by Freddie_Snowbits View Post
Another point to note is that the Incandescent lamp would also produce 10 x (100-11) x 30 27kw of heat during the same period, and this would reduce your gas cost by (using SP online at 4.52p per kW) by 1.20 in the same period.
Add 50% to your savings on heat!!

The OP and KY used a 15 hour day to reach a cost of 5.40
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# 9
KimYeovil
Old 08-02-2009, 8:59 PM
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Ah but light is used 365 days a year whereas heating is only used 36 days a year. So 90% of the time the heat is irrelevant.

(I may be exaggerating a bit.)
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# 10
gazza007
Old 08-02-2009, 10:17 PM
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Quote:
It appears that you cannot use these bulbs with dimmers or timers as there is always residual current. although it is always there it is not sufficient to power a incandescent bulb, but will power a energy one.
My bulbs were then removed and remain redundant. I have been told that I can buy low energy bulbs for dimmers / timers but they cost a few quid each.
Any further thoughts.
I use the mechanical timers for a couple of table lamps & have never had any problems.
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# 11
Sirbendy
Old 08-02-2009, 11:20 PM
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same here. I have one on a timer to come on so I can see the cats before they try to steamroller me in the doorway at night.. No issue.

Possibly the ELECTRONIC timers may have issues..I know apparently some PIRs do too, but I use the cheap segmented mechanical timers, since I got 3 for a fiver at the sunday market 2 years back!
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# 12
Poppy9
Old 09-02-2009, 12:33 AM
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I don't use ES bulbs on my dimmer lights as I had read somewhere you shouldn't. I do use them on lamps which I plug into electronic timers when we are on holiday and they work fine. I only have the problem with the one in the hallway. I will replace it tomorrow with another ES bulb and see if that is okay. It may just be a faulty bulb.
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# 13
Rusty!
Old 09-02-2009, 12:48 PM
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Quote:
Originally Posted by Poppy9 View Post
I don't use ES bulbs on my dimmer lights as I had read somewhere you shouldn't. I do use them on lamps which I plug into electronic timers when we are on holiday and they work fine. I only have the problem with the one in the hallway. I will replace it tomorrow with another ES bulb and see if that is okay. It may just be a faulty bulb.
You can get 'special' dimmable CFL bulbs now, I've got one and it works great.
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# 14
Freddie_Snowbits
Old 09-02-2009, 7:13 PM
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OK here is one to throw in.

Hi Brite White LEDs powered from Solar Panels. Seems the technology is already there, but the greenwash industry is set up to flog off mercury filled ES bulbs.
http://www.electronicsweekly.com/Art...white-leds.htm
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# 15
illuminate
Old 09-02-2009, 7:56 PM
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Quote:
Originally Posted by Freddie_Snowbits View Post
OK here is one to throw in.

Hi Brite White LEDs powered from Solar Panels. Seems the technology is already there, but the greenwash industry is set up to flog off mercury filled ES bulbs.
http://www.electronicsweekly.com/Art...white-leds.htm
Not quite right. Govt subsidies on CFLs are due to end later this year now manufacturing costs have been reduced and discussions are already underway to switch the funds to LED light sources.

Its funny but as consumers we never learn. All products have a natural commercial life. They start as high cost, high end professional products and end as low cost consumer items with many other steps in between.

The problems start when companies and individuals try to rush technology too quickly from one sector to another. The result.... complaints and cynacism engulf perfectly good products that just needed a little more time to develop.

I would like to think that those currently slagging off CFLs are not the same people trying to run before they can walk with LEDs.
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# 16
oldwiring
Old 09-02-2009, 8:03 PM
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Quote:
Originally Posted by Rusty! View Post
You can get 'special' dimmable CFL bulbs now, I've got one and it works great.
Are they generally available from the usual outlets? A while ago doing a google led me to think they were specialist and quite expensive in comparison with the usual ES bulbs.

As to the ESs in general I think there is a way to go in minaturisation: many lounge fitments take small bulbs such as golfballs. ESs would look entirely inappropriate.
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# 17
illuminate
Old 09-02-2009, 8:10 PM
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Quote:
Originally Posted by oldwiring View Post
Are they generally available from the usual outlets? A while ago doing a google led me to think they were specialist and quite expensive in comparison with the usual ES bulbs.

As to the ESs in general I think there is a way to go in minaturisation: many lounge fitments take small bulbs such as golfballs. ESs would look entirely inappropriate.
There are all-sorts available, but possibly not yet at a price that a domestic user could justify.

Like I said.... slowly slowy catchee monkey
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# 18
Sirbendy
Old 09-02-2009, 9:31 PM
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LEDS are good, bordering on very good indeed...but they're VERY directional, even my 60degree homebuild LED lamps aren't as good a "room illuminator" as a CFL. Bright, yes. Enough to see by? Oh yes. Painful to look at, indeed..but they're not quite there yet.

Even jems cree torch, while it is STUPIDLY bright, would only really work as a spotlamp.

I have a BC cap 24 LED lamp - I used to use it at mums on a timer to light the way to the guineapig cage at night. Here I can use it for room lighting, but by god it's dim. It'd make a good reading light.

I also have a battery powered 8 led beside reading flexi-light..much newer than the 24 led bulb..and it's a damn sight brighter. Too bright almost. It lights the bedroom to a subdued level most effectively.

I love LEDs - if you google "joule thief", you'll find the circuits I play with that allow me to run several white ones at high brightness from batteries too dead to do anything else, for several hours at least. They make ACE emergency low-level room/stairs/bathroom lighting.

I personally use them because as much as I like the ambience provided by candles, with cats about I need something safe, as well as a bit brighter.

The technology is fast developing though..I'm watching it with interest. I have a solar charged, LED based PIR lamp that's nice and effective...that said, I also have a small solar setup charging a car battery, that I use to run an AA/AAA battery charger, charge my phones etc, and eventually to run a small inverter to allow me to smile in a power outage.

Got to love technology..
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# 19
Rusty!
Old 10-02-2009, 12:04 PM
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Quote:
Originally Posted by oldwiring View Post
Are they generally available from the usual outlets? A while ago doing a google led me to think they were specialist and quite expensive in comparison with the usual ES bulbs.

As to the ESs in general I think there is a way to go in minaturisation: many lounge fitments take small bulbs such as golfballs. ESs would look entirely inappropriate.
Sure are, I picked mine up from B&Q. Wasn't with the rest of the bulbs though, for some reason.
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