What is IK Rating? - Impact Protection for LED Lights Explained

Q: Is IK rating the same as IP rating?

No. IP (Ingress Protection) rates resistance to solid particles and water entry - it is about sealing. IK (Impact Protection) rates resistance to mechanical impact - it is about physical strength. Both are needed for outdoor lights: IP65 prevents water damage, IK08 prevents impact damage. Both should be verified independently.

Q: Can I check IK rating from looking at the fixture?

Not reliably by eye alone. IK09/IK10 fixtures often look similar to IK06 fixtures from outside. The key physical indicator: tempered glass (IK08) has a characteristic fine dot pattern visible at the edge when held to light - this is the thermal tempering grid. Polycarbonate (IK10) is noticeably lighter in weight. Ask for the IK test report from a NABL lab for certainty.

Q: What happens to IP rating if the IK-rated cover is cracked by impact?

A cracked cover destroys the IP rating - water and insects enter immediately. This is why IK rating matters even if your primary concern is IP. A fixture with IK06 cover may be IP65 when installed but could be IP20 after the first stone strike. Investing in IK08+ cover protects both the physical housing and the IP integrity throughout the product's life.

What is IK Rating? - Impact Protection for LED Lights Explained

IK rating measures how well a light fixture's enclosure resists mechanical impact - from stones, accidental knocks, vandalism, or tool drops. It is separate from the IP (water/dust) rating and equally important for outdoor street lights in public spaces.

By Xera Tech Team · Updated June 1, 2025 · 4 sections

The IK Scale

IK rating is defined by IEC 62262. The scale runs from IK00 (no protection) to IK10 (highest protection). Practical values for street lights: IK06 = protected against 1 joule impact (35g dropped from 285mm - equivalent to a light accidental touch). IK07 = 2 joule (500g from 400mm - moderate impact). IK08 = 5 joule (1.7kg from 300mm - firm punch equivalent). This is the minimum for public road street lights. IK09 = 10 joule (5kg from 200mm - heavy tool impact). IK10 = 20 joule (5kg from 400mm - severe blow). Used in high-vandalism areas and sports facilities.

Why IK Rating Matters in India

Street lights in Indian public spaces face regular impacts: stones thrown by children (IK08 resists stones up to the 5-joule threshold), construction vehicles brushing against roadside poles, accidental contact by tractors, trucks, and heavy machinery on rural roads, and deliberate vandalism in some urban areas. A cover glass rated only IK06 shatters from a stone impact that an IK08 cover would survive. Broken cover glass exposes the internal driver and LEDs to rain, insects, and dust - accelerating total failure. For gram panchayat road lights: IK08 minimum. For bus stops, urban footpaths, school areas: IK09. For high-vandalism zones: IK10.

IK Rating and Cover Material

The IK rating is achieved through the material of the outer cover/lens: Standard borosilicate glass (untreated): achieves IK06–IK07 at best. Tempered safety glass (used in Xera Tech products): achieves IK08–IK09. Polycarbonate (PC) lens: achieves IK10 but yellows with UV exposure over time - not ideal for outdoor use without UV stabilisation. UV-stabilised polycarbonate: achieves IK10 + UV resistance - used in premium outdoor fixtures. For Indian conditions, tempered glass with IK08 is the standard specification that balances cost, durability, and optical clarity. All Xera Tech outdoor LED street lights use tempered glass covers rated minimum IK08.

Frequently Asked Questions

Is IK rating the same as IP rating?

Can I check IK rating from looking at the fixture?

What happens to IP rating if the IK-rated cover is cracked by impact?