I've been replacing my older tungsten bulbs for years now, starting with compact fluorescent lamps (CFLs) and more recently directly with LED lamps
Although I'm already saving money having switched to CFLs I'm getting fed up with the low light output, the long start times and the noticeable way the light output decays with time so that all too quickly the lamps become next to useless. An example are the candle lamps I have in my dining room.
The light fitting held eight 40W tungsten lamps so the room was nice and bright, but at a total of 320W was very expensive to run (over £110 per year using the lamps an average of six hours a day).
I replaced the tungsten lamps with eight 7W compact fluorescents and for a while these have been OK but lately the light output has faded and the electronic ballasts used in the bulbs have started to whine, so these replacements have not only become annoyingly dim but also annoyingly noisy!
They have got to go.
I've been looking for a suitable replacement for these for a while - and while it is easy to justify buying LED bulbs to replace tungsten or halogen lamps you do have to be careful replacing the compact fluorescent lamps because the power savings are nowhere near as great. However, I think I've found a bargain. I've found a source of a triple pack of Duracell 4w LED Candle Light Bulbs at a very good price.
Not only are these slightly cooler colour temperature than the old compact fluorescent bulbs, but they are cheaper to replace and run at an even lower wattage so I will make savings when these are fitted. To prove this I knocked up a quick spreadsheet calculator that you can download here
In the spreadsheet I have assumed that a unit of electricity costs about £0.15 and that the lamps are run for an average of six hours per day. From this:
- A 40W tungsten lamp costs £13.10 per year in electricity and may need to be replaced twice.
- The 7W CFL costs £2.29 per year to run and may last five years.
- The Duracell 4W LED lamp costs a miserly £1.31 per year to run and should last 10 years.
You can use the calculator to work out how much you can save, but do bear in mind that if a lamp is only used an hour or so a day (perhaps in a cupboard under the stairs) it may not be worth replacing it at all with an LED lamp. Just enter the details of the lamps you want to compare in the yellow boxes and adjust the electricity costs and hours per day to suit you and the rest of the sheet re-calculates for you (it should be easy to convert to other currencies too but I'll leave that up to you).
The new LED lamps arrived today and they're all fitted. They're bright with a good colour balance and are noticeably brighter than the old 7W compact fluorescents so that's a good start. They're instant-on, which means I get light immediately I turn the switch on (not 30 seconds to two minutes afterwards) and they're silent. No more whistling and whining from the lamps!
|Colour Temperature||2700K (Warm White)|
|Expected life||25,000 hours|
|Power Cycles||approx. 40,000|