Even before you deal with the McGyver and Mr Wizard details, what about the room lighting? What is with the blue lights and /or no lights?

Having worked in hospitals and police stations and laboratories I can assure the producers that these facilities are well illuminated and in the case of courtrooms, MUST meet minimum ft/candle illumination in all areas.

Why when the scene shows entering a house IN THE DAYTIME with lots of windows, do the techs need flashlights and why are there shadows every where at 12 noon?