1. In many cases you can use lower wattage bulbs and get same amount of light. Look for lumens on the bulb (CFL) & not for watts. Lumen indicates the brightness while power indicates eenrgy required to illuminate the area.
2. Always plan bulb location in such a way that the light is not hindered by any other room fixture.
3. White light is more comfortable than any other light for reading & day to day use. So should consider it in studies, drawing room etc. Other types can be considered for infrequently used areas e.g. toilet, bathroom etc.

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