What major points does the police consider when installing led strobe warning lights with siren

When police departments install LED strobe warning lights with sirens, they dont just pick the brightest led lamps.They need to make balanced consideration on legal compliance, officer safety, and public psychology.

Police equipment must adhere to strict traffic regulations and certifications. In most regions, Blue color is reserved exclusively for law enforcement. Red is often used in strobing combination with blue or for fire/EMS.E-mark or DOT certification is mandatory to meet SAE class I requirement in order to ensure that the led strobe warning lights are visible even under the sun. Police cars focus on "360-degree coverage" so the vehicle is seen from every angle, especially at intersections.

Roof-mounted magnetic absorbing strobe warning light bars provide the main 360-degree warning. LED Grille lights near the bumper, side-mirror LED lights, and "hideaway" strobes in the headlights help clear traffic when approaching from behind. Rear-facing amber or blue LED warning lights that can "sweep" left or right to direct traffic away from an accident scene.

Slower, synchronized flashing patterns are often preferred over "chaotic" flashing. Rapid, unsynchronized strobes can cause "moth-to-flame" effects, where careless drivers accidentally steer toward the lights. Many systems include a "night mode" that automatically dims the LEDs by 50-70% after dark to prevent blinding other drivers or the pedestrians nearby. 

Safe power management is also vital. LED warning lights are often integrated into the vehicles computer system  so they can react automatically—for example, turning off the driver-side warning light bar when the door opens so the officer isnt blinded while exiting.

Many police departments now use audio systems like the "Rumbler" or "Howler", which produce low-frequency vibrations that motorists can actually feel in their chest or steering wheel, helping to alert drivers with loud music.
Sometimes, for some special operational stealth, the police will choose visor lights and rear-deck light bars that are virtually invisible until activated. The dark-tinted lens on led lights will help hide the identity of police vehicle during some operation in the daytime.