IPX is a standard given to products so you can compare them against each other – and know what level of water resistance and dust ingress they offer.
Headlamp Water Resistance Ratings and What they Mean
IPX-0 No special protection – rain can short this out.
IPX-1 Protected against falling water (rain). Equivalent to 3-5mm of rainfall per minute for a duration of 10 minutes, while headlamp is worn on head as normal.
IPX-2 Protected against rain when tilted 15° any direction from normal operating position.
IPX-3 Protected against spraying water from top. With headlamp worn on head, water spraying from 0 to 60° to the side at 10 liters per minute at a high pressure for at least 5 minutes.
IPX-4 Protected against splashing or sprayed water from any angle for some time.
IPX-5 Protected against pressurized water jets – Water projected at all angles through a 6.3mm nozzle at a flow rate of 12.5 liters/min at high pressure for 180 seconds at a distance of 3 meters.
IPX-6 Protection against water sprayed at any angle – high volumes of water for at least 180 seconds from a distance of 3 meters.
IPX-7 Protection against submersion in water. Immersion for at least 30 minutes at a depth of 1 meter.
IPX-8 Protection against submersion in water for more than 30 minutes in at least 2 meters of water. The manufacturer can choose to specify the exact conditions under which the equipment is tested and warranted against failure.