I tested these bulbs with 3 The DIY Smart Saw
different meters to make sure my tests were accurate. I tested it with a Fluke and a Klein meter. I series it with amperage rather than just a clamp on which can be a little leery so I series a circuit through a lamp and the amperage came up showing 20. It showed half the amount of wattage of an incandescent yet almost twice as much as the package advertises. It is better but it is still not as advertised. The packaging on the CFL did not line up with their own wattage of what they were actually using.System 1: Cavity Wall Insulation Cavity walls became popular in Ireland in the 80s. Quite simply they are two walls built side by side with a gap of about 60mm between them. The cavity between the two walls in older houses can be filled will insulation and new homes nowadays are built with excellent approved insulation material in the cavity. If you have a cavity wall, it is fast and easy to pump in insulation. Of the three systems mentioned here this is by far the cheapest. If you don't have a cavity then this system will not work.
Also please don't confuse cavity blocks with a cavity wall. With a cavity block 80% of the heat loss pass through the block and only 20% crosses the air gap. So even if you could find and fill all cavities you would only fix 20% of the problem.System 2 Internal Insulation: Internal insulation is where you attach insulation to the inside of a wall. So where the wallpaper is currently you stick about 100 mm of insulation material on to the wall and finish it with plaster board, then you can redecorate. This solution is cheaper than external insulation and if you are redecorating it can be included in the project with a minimum amount of hassle.