Twenty feet -- that's six meters. Other suggestions include putting more distance between you and the device and using good lighting.

VOA: special.2011.08.01

This modern festival of African-American culture includes lighting candles each night from December twenty-sixth through New Year's Day.

VOA: special.2009.12.21

And as the country prepared for a period of mourning, people were seen lighting candles and placing flowers in front of the Presidential Palace in Poland's capital Warsaw.

VOA: standard.2010.04.10

In contrast,a light bulb has much more impact in the use phase, where it's using the energy, and where you can reduce that with more efficient lighting technologies,"

VOA: standard.2009.03.30