If you want to replace it with an LED fluorescent tube, how many watts does it take?
If 40 w incandescent bulb lamp, LED lamp in 7 w. With the proportion of electricity savings, incandescent lamp and fluorescent lamp were similar, LED lamp is incandescent lamp energy saving energy saving 80%, energy-saving lamps than incandescent lamp energy saving in about 60-70%
This depends on the type of the lamp. For example, the bulb bulb, LED and incandescent, usually we calculate at 1:7 or 1:8, and there is a 1:10 calculation.
Commonly used household generally is 1.2 meters, is a traditional fluorescent label 36 w, combined with the actual total power dissipation of the ballast at about 40 w. If replace with LED fluorescent tube, 18 w is enough light. Such as check brightness demand is not high, some useful also 16 w to replace.