Cheapness is not the only thing to be considered when purchase police lights
Halogen lights are definitely cheap police lights, especially if the vehicle is not to be used continuously. There are construction vehicles, delivery trucks etc. which may need to use their lights only when parked, and may require only small lights necessary to alert other vehicles of their presence. Likewise there are volunteer firefighters who may need to use their emergency lights only occasionally. For them halogen lights may turn out to be economical even though power consumption of halogen is more than that of LED.
LED lights will last a few decades, so far as it is well maintained. This means that it will have a much longer life than the vehicle on which it will be used. If the users are indifferent to this quality of the LED light bar and will choose to dispose it off with the vehicle, then it will definitely not work out to be cost effective and will only turn out to be expensive. If so, conventional halogen lights will turn out to be cheap police lights.
Just the fact that it comes cheap is not a sufficient reason for buying a thing, whether it is a police light or a bulletproof vest. You should also find out the full range of features of the police lights for sale, and decide whether these features are what you actually expect in the lights that you want to install. The color combinations, flash patterns, and size could be different from what you require for your vehicle.
Further, even if its features satisfy your requirements, the cost effectiveness of the lights should also be considered. An LED light may give decades of service but if you need it only as a reserve for unexpected emergency uses, and is unlikely to use it continuously, it may not be a right investment. You can also put a budget for buying the police light for sale, based on for what purpose you need it. That will also help in decision making, even after taking all other things into consideration.
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