Maintenance is virtually non-existent. Modern versions are powered by a lithium-ion rechargeable battery that will last for years before it needs replacement. The high output LED lights will virtually never burn out and the solar panel is maintenance free. Once the light is in place, the only maintenance there will be is to change the battery, and that won't happen for years down the road.
High output LED light fixtures give off a bright white light. This makes it easy to see in the illuminated area at anytime of the night. However, the best part about solar powered security lights are the fact that even in a power outage, they will still work. It doesn't matter if there is limited power, fluctuating power or no power at all. Since solar powered security lights get their power from the sun, they will come on at dusk regardless of what is happening with the electrical supply grid. No matter what, the area you need illuminated will always be lit.
Of course, solar power means there is no associated energy cost to make it work. The more lights that are put in place, the more savings you'll realize. For example, if you have ten 400-watt security lights surrounding a building, they are using 4000 watts of electrical grid power for 8 to 10 hours per day, every day. Since a solar powered security light uses no grid electricity at any time, once purchased, there is no more associated energy cost to use them. That also means that for those properties that are striving to meet environmental regulations, there is no easier way than to install solar powered security lights.
The question that needs to be asked is, why doesn't every town, municipality or city with public buildings have them installed? The price per fixture is comparable to a hard wired security light, there won't be any maintenance costs once they are installed, illumination quality is virtually the same, or better, than grid powered fixtures and the energy savings will continue to add up every night that they shine, week after week, month after month and year after year.