The IK rating indicates how impact resistant a lighting fixture is. In other words: it shows how well a lamp or fixture can withstand mechanical shocks.
The IK rating is displayed on a scale from 0 to 10:
IK00 – Very little protection against impacts
IK10 – Very high protection against impacts
The higher the IK rating, the more robust and impact resistant the fixture is. This is important for applications in public spaces, workshops, or outdoor environments where fixtures are at risk of bumps or collisions.