Lighting Shane's bedroom

This task is about different sources of light.
Shane can get his bedroom to the same brightness by using the lights shown in the table.
 
Type of light Number needed to get  the same brightness in the room Total energy used every second (joules) How long does it  last before you have to buy a new one?
three types of light source 120 candles 4800 J 2 hours
1 light bulb 100 J 9 months
1 low energy bulb 18 J 2 years

Question

a)  Which type of light would be best if there was an electrical power cut?

    • candle

    • light bulb

    • low energy bulb

Why did you choose that one?

Question

b)  Which is best for saving energy?

    • candle

    • light bulb

    • low energy bulb

Why did you choose that one?

Question 2Change answer

c)  Fill in the table below, describing one good thing (advantage) and one bad thing (disadvantage) about each type of light.
 
Type of light Advantage Disadvantage
three different types of light source