Products suitable for indoor use, like bedroom, living room, office, etc.
Products suitable for special areas that are semi indoors or areas with high dust/water usage, like balcony, bathrooms, etc.
Products suitable to be used for outdoors, like street lighting, landscape lighting, etc.
Here is a comprehensive guide as to how you can understand what the NUMBERS on the IP rating mean-
No special protection<
Protection from a large part of the body such as a hand (but no protection from deliberate access); from solid objects greater than 50mm in diameter.
Protection against fingers or other object not greater than 80mm in length and 12mm in diameter.
Protection from entry by tools, wires etc, with a diameter of 2.5 mm or more.
Protection against solid bodies larger than 1mm (eg fine tools/small etc).
Protected against dust that may harm equipment.
Totally dust tight.
No special protection
Protection against condensation
Protection against water droplets deflected up to 15° from vertical
Protected against water spray
Protected against water spray from all directions
Protection against low pressure water jets (all directions)
Protection against strong water jets and waves.
Protected against temporary immersion.
Protected against prolonged effects of immersion under pressure.
After considering the IP numbers, you can decide which fixture is most suitable for your requirement.