What Is IP Rating?

Definition, standards, typical values, applications and the procurement checks for IP Rating.

🕒 Updated 2026-09-17 · 🧾 Verified by the CompareDeals lighting team

Definition

IP Rating is easy to quote and hard to verify, which is exactly why it belongs in the purchase order.

IP Rating is a design or procurement concept that decides how a project moves from a requirement to an executable specification.

Concepts cannot be reduced to one number, but they surface after installation as comfort, energy or maintenance frequency.

How Does It Work — IP Rating

Making a concept real needs three things: a performance goal, a measurable criterion, and hardware specifications that agree with it.

Without the criterion, each party reads the same result differently and handover stalls.

The reliable route is to translate the concept into four measurable terms: illuminance, uniformity, colour temperature and glare limits.

Key Data: Specifications & Standards

The gasket and cable gland, not the housing, decide the rating: verify both are rated parts

Reference standard: IEC 60529

Applications: Where It Fits

IP Rating appears in the design document, the purchase order and the acceptance test; all three must quote the same figure with the same condition.

When the three documents disagree, the usual outcome is a compliant fixture inside a project that fails inspection.

Comparison to Alternatives

Common Pitfalls and Specification Rules

Translate the concept into measurable acceptance clauses.

A "waterproof" claim without a gland spec usually means an IP54 assembly sold as IP65.

• Run a mock-up at the sample stage on the real surface and ceiling.
• Agree in advance how a deviation will be handled: rework, adjust or accept.

Conclusion & Procurement Recommendation

Match the IP to the cleaning method, not to the weather: steam cleaning needs IP69K, hosing needs IP66.

Deviations found at goods-in cost a rework; deviations found after handover cost a project.

Frequently Asked Questions

What is a normal compliant value for IP Rating?

Match the IP to the cleaning method, not to the weather: steam cleaning needs IP69K, hosing needs IP66. Most commercial projects sit in the standard tier; only a stated requirement justifies moving up.

How can I verify the figure a supplier quotes?

Ask for the report against IEC 60529 and check that the model on the report matches the model being shipped.

How much does IP Rating vary between batches?

Batch consistency depends on keeping one emitter bin and one driver platform. Change either and you must re-sample.

How should this be written into the purchase order?

Value + standard + test condition + tolerance band. Miss any one of the four and the supplier has room to interpret.

What if the project is already under construction?

Test on site, quantify the deviation, then decide between rework, adjustment or acceptance and record the decision.

📋 Sources & Verification