1.How to explain “lumen output “ ?
The total lumens emitted of a light source, system, or solution.
2.What’s efficacy about the light ?
The light output of a light source divided by the total electrical power input to that source, expressed in lumens per watt(lm/w).
3.LEDs are more expensive than other lighting options.why ?
LEDs can operate as standalone devices,but when grouped or clustered they require additional steps to operate properly. LEDs need proper components such as a circuits can be designed rapidly, but to ensure that they operate correctly and for long periods of time they require testing.