SLV 48V Track Stereo Recessed L Connector White

This indicates whether the light source is included or not. If the lamp(s) are not included, you will find the matching lamp in accessories.

The IP rating is a standardised rating system that indicates the degree of protection the device provides against the ingress of solid objects (such as dust) and liquids (such as water). For example, an IP65-rated device has good protection against solids (IP6X) and is resistant to spray water (IPX5). The higher the IP rating, the better protected the device is. "Read more.

This tells you whether the manufacturer allows the product to be installed outdoors. Lighting for outdoor use has better resistance to elements such as rain, heat, UV or even corrosion. These fixtures always have a higher IP rating to prevent water damage.