Rig Lights

"Riglights are very useful, especially in the night operations.

 In day time (LandRig Based, broad daylights), riglights at mudtanks, rigfloors, doghouses, derricks, BOP Stacks, rig storage houses, etc are unnecerssary & if possible be turned-off to reduce Electric Genset Loads, Fuel Consumptions and to make Genset life longer". 

 Above was written in a Stop Card (landrig based), in Asia Pacific. It was contested by the Rig Authrority & not follow the recommendation and according to him

1.) Once Riglights are turned-off during daytime,  might have a problem to turn-ON

 2.) Since in tropical location, moisture easily accumulated inside the RIGLIGHTS fixtures and when re-started, bulbs usually burst, so he just keep the Riglights on 24/7.

 QUESTIONS:

 1.) From technical point of view, is it possible there something wrong with the lighting fixtures that moistures gets in, if yes, what's the solution?

 2.) From economics point of view, is it beneficial just keep the Riglights ON 24/7?

 3.) What's the usual practice in the Oil, Gas, & Geothermal Land Rigs, regarding these Rig Lights?  Keep them ON 24/7?