12-10-2013, 09:27 AM
(This post was last modified: 12-10-2013, 09:28 AM by ppppenguin.)
Quick calc.
4 x 50W halogen on for average 5 hours a day uses 365kWh per year. If leccy costs 11p/kWh that's £40/year. The LED downlights I recommended use about 11W each so 22% of the power of the halogens hence cost only £8.80/yr. Hence on this basis payback is about 4 years. You continue saving for a long time afterwards too. As fuel prices rise you save even more.
As for heat, I'd rather buy gas at about 3.5p/kWh than leccy at about 11p. At those prices I'd also rather put the heat into the room where I want it rather than at ceiling height. Actually ordinary rads do a fairly poor job of putting heat where you want it. I'd like to have underfloor heating (no rads taking up space, use less fuel for comfortable house, puts heat exactly where you most want it) but that's a huge job to retrofit.
4 x 50W halogen on for average 5 hours a day uses 365kWh per year. If leccy costs 11p/kWh that's £40/year. The LED downlights I recommended use about 11W each so 22% of the power of the halogens hence cost only £8.80/yr. Hence on this basis payback is about 4 years. You continue saving for a long time afterwards too. As fuel prices rise you save even more.
As for heat, I'd rather buy gas at about 3.5p/kWh than leccy at about 11p. At those prices I'd also rather put the heat into the room where I want it rather than at ceiling height. Actually ordinary rads do a fairly poor job of putting heat where you want it. I'd like to have underfloor heating (no rads taking up space, use less fuel for comfortable house, puts heat exactly where you most want it) but that's a huge job to retrofit.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
