The efficiency of the solar panels, including the reduction in their size, as well as the quality of the batteries they charge and the timing of the last purchase of solar lights...The efficiency of solar panels, including the reduction in their size, plus the quality of the batteries they charge and the length of time they last charged, makes it very economical to buy solar lights.A long time ago, if you want an outdoor light, you have to assemble the light, dig the ditch, run the wires, find the outlet for the transformer (these are low voltage systems using 12 V ), connect the lights to the main cable, cover the ditches and go back and enjoy the fruits of your labor.Assembly of lights can be a major effort in some less expensive kits.The tolerance allowed is large and can be used by the manufacturer.Then you need to have the power of Hercules to connect the wiring system, solar outdoor lighting has made rapid progress in the past decade.If your soil is tight, digging a ditch can be one thing.If there is a sidewalk or driveway, then the work is just beginning to try to get your main cable through these obstacles.They work well before the bulbs start to age, and then they fade a little, burn out, or their connections are corroded and need to be cleaned and re-inserted occasionally.Looking for a bad connection can and does take a lot of time and effortit yourselfer.In the beginning, there was only one color for solar lighting.This is a blue and white color that looks artificial.They have evolved to include an amber color that is less artificial and more flattering for the Observer.For people who like this effect, they still have the original color.They can be purchased individually or in complete sets.If you just want to light up a feature in the yard, such as a tree or a corner of the house, you can purchase the lights separately to do so.But if you want to illuminate the road to the front door or the edge of the driveway, you can purchase a complete set of lights to achieve this.It is never easy to install outdoor lights.All you need to do is decide where you want to install the light and stick it to the ground.If you decide you don't like that place, just pull it up and move.There are no new lines to run or move.There is no timer to set, and there is no difficult connection to worry about.Overall, for those who spend a lot of time installing all the components associated with the old system and the maintenance they need, they are somehow cheaper and reliable.For people who are busy and like instant gratification, not sure where they want to install the lights and may want to change the position of the lights for a different effect, the way to go is the solar lights