Each unit combines 4 things in one housing LED light panel The array of LED modules on the front. More LEDs = higher wattage and brightness. You can see 3 sizes here, so they’re likely different wattages, e.g. 100W, 150W, 200W.
Solar panel It’s on the back side, not visible in this photo. It charges during the day Battery* - Lithium battery built inside the casing to store power Controller + Sensor* - Manages charging, dusk-to-dawn auto on/off, and often motion sensing/dimming.
The pipe mount at the bottom is for mounting on poles 6-12m high.