Ever thought to reduce the energy demand by a thoughtful optimization of your house or flat? This will reduce future costs and the energy demand. O.k., you are right. You have to invest some money. But this is meant by "thoughtful".

Check the balance between investment and benefit for different measures and different options to find the optimum package!

The big question is: Which light source provides the higher light output per watt of electricity? Many believe that flourescent lamps have a 5 times higher light output per watt. That is true with standard light bulbs. But it is not true for modern state of the art light bulbs.

Energy cannot be defined the easy way ... ... but there is always a chance to understand energy. By getting closer and closer after time.

Energy - simply - drives everything in our universe. But in comes in different flavours which doesn't make it easier to see the one thing behind.