Completed switch to LED bulbs

Froggitt

JJ_Egan wrote: »

Its the savings i find odd .
Cost £90

Save £90 off lighting bill in twelve months really ??

So...........making the calculation simple for myself, using the calculation and modified assumption from the Crompton website

Based on annual usage 3 hrs/day @ £0.1437kWhr

16 bulbs

£5.50 saving a year per bulb

£88.11 saving per annum

Mister_G

JJ_Egan wrote: »

Its the savings i find odd .
Cost £90

Save £90 off lighting bill in twelve months really ??

Let's do the sums:

5W LED (60W incandescent equivalent)

16 x 5W x 3 Hours x 365 Days x 12p/unit = £10.51

60W Incandescent

16 x 60W x 3 Hours x 365 Days x 12p/unit = £126.14

Difference = £115

So yes, the OP's assumptions are correct.

Mister_G

Mister_G wrote: »

Let's do the sums:

5W LED (60W incandescent equivalent)

16 x 5W x 3 Hours x 365 Days x 12p/unit = £10.51

60W Incandescent

16 x 60W x 3 Hours x 365 Days x 12p/unit = £126.14

Difference = £115

So yes, the OP's assumptions are correct.

Even assuming a 40W replacement, this works out at £72 saving

sevenhills

Froggitt wrote: »

So...........making the calculation simple for myself, using the calculation and modified assumption from the Crompton website

Based on annual usage 3 hrs/day @ £0.1437kWhr
16 bulbs
£5.50 saving a year per bulb
£88.11 saving per annum

How much is your normal total electric bill?

chiny

Froggitt wrote: »

They are 2700K and a really nice warm white.

Ah yes, K not ºC. The dangers of posting before consuming at least 3 mugs of tea

Froggitt

sevenhills wrote: »

How much is your normal total electric bill?

About £600 a year. Why?

sevenhills

Froggitt wrote: »

About £600 a year. Why?

That is a large bill, my anual electricity bill would be around £250, with a small proportion of that being due to lighting.


You are using 16 light bulbs for 3 hours per day; I probably have around 12 bulbs, but only a few will be used for more than a couple of hours, the remainder hardly used at all.
I have one LED which I leave on when I go out.


Household appliances account for for most of the electricity used in a home, around a fifth of an average home’s electricity bill is down to lighting, items on standby account for around 10% of a typical home’s electricity bill.

JJ_Egan

16 bulbs on for 3 hours thats where i get confused .
Me bulb 1 kitchen on for 2 hours .
Bulb 2 living room 1 bulb this time of the year on for about 4 hours .
Bulb 4 bedroom on for about 2 hours .
Other odd rooms lets say max 2 hours variable usage .


Save £90 pa + how much they tell me i will save with a smart meter .This time next year rodders.

matelodave

I suppose it depend on the layout and usage of your rooms.

Our kitchen for instance is around 5 metres deep and faces north so is quite gloomy and need the lights on for most of the time that we are using it. 10 x 50watts costs us about 6.25p an hour whereas 10 x 4 watts costs around 0.5p an hour so just one hour a day of lighting saves us £21 a year and that's only the kitchen.

Our study has 16 watts instead of 200 and also faces north so the lights are on for 5-6 hours a day in the winter, less in the summer, but would still be saving around 90% of the cost of incandescent lighting.

The lounge has three 6 watt bulbs instead of three 100 watt one we had in the table lamps and they are on for around six hours a day at this time of the year. The lounge ceiling lights, which don't get used much, have 6x3watt bulbs instead of 6 x 35watt ones but as they came from Poundland they dont really owe me anything.

We've now changed all our lights to LED (except the hall which has low energy lamps and is only on for about 5 minutes a week) and I guess that we probably save around £100 a year on leccy. We'd save evn more if our leccy was more expensive.

The other advantage is that we've not had to replace any in the last six years, whereas the halogens in the kitchen were only managing to last around six months.

sevenhills

matelodave wrote: »

but would still be saving around 90% of the cost of incandescent lighting.

Surely very few people who keep an eye on the cost would still be using incandescent bulbs, most would have moved over to CFLs.
The saving from CFL to LED can be around 10%, only worth doing when the CFL bulbs fail.