There are several types of light bulbs to choose from and some are inevitably better than others. In general, our main concern is to be able to save as much energy as possible. But there are also other factors that could influence our decision. For example:
The luminous efficiency of a light bulb.
Most people prefer light bulbs that are more luminous and they often prefer to pay more but to also have more light. Light is measures in units called lumens and they correspond to the amount of light that is produced per watt. Of course, no source of light available today is 100% efficient. Fluorescent light bulbs are the most luminous efficient and they only offer between 9% and 11%. Incandescent light bulbs stand between 1.9% and 2.6%. So CFL bulbs are the most efficient in this case and they are followed by halogen bulbs and incandescent bulbs.