Assuming you have 1000 W of lights - that's a huge amount. The only way you can use this much in your home is if you use incandescent bulbs - turning them off for 1 hour saves 1 kWh (3.6 MJ). But switching to energy-saving fluorescent bulbs, which only use 25% of the energy, would save you 0.75 kWh every hour. That's 6 kWh every day - assuming you use your lights for 8 hours a day.
Ok maybe you're more environmentally conscious and already use fluorescent bulbs. Maybe you're only using 250 W on lighting - then you only save 0.25 kWh.
- Turning off your computer will save 3 kWh overnight, and 15 kWh over the weekend. That's 12 times as much saved, every day.
- Reducing your shower by only 1 minute, assuming your water is only heated by 10C, saves 0.1 kWh - and 10 litres of water. A hot shower is 40C and water coming in may be as low as 10C, so 10C of heating is really low.
- Your car uses about 1.3 kWh per km, and you can save even more energy by adjusting your thermostat.