IP Ratings for LED Lighting: What Specifiers Need to Know

What is an IP Rating?

The IP code consists of two digits:

• First digit (0–6) — protection against solid objects, from no protection (0) to dust-tight (6) • Second digit (0–9) — protection against water, from no protection (0) to high-pressure steam cleaning (9)

For example, IP65 means: • 6 = dust-tight (no ingress of dust) • 5 = protected against water jets from any direction

The rating is determined by testing to BS EN 60529. Manufacturers must test the complete luminaire — not just the housing — because the weakest point (cable entries, diffuser seals, driver compartments) determines the rating.

IP Rating Chart

Common IP ratings for LED luminaires and their meaning:

• IP20 — Protected against solid objects > 12mm (fingers). No water protection. Suitable for dry internal environments only (offices, classrooms, retail).

• IP40 — Protected against solid objects > 1mm. No water protection. Common for recessed downlights and track systems in dry interiors.

• IP44 — Protected against solid objects > 1mm and water splashes from any direction. Minimum for bathrooms (Zone 2) and some covered exterior areas.

• IP54 — Dust-protected and splash-proof. Suitable for food preparation areas, light industrial environments and covered walkways.

• IP65 — Dust-tight and protected against water jets. The standard specification for industrial, car park, weatherproof and exposed exterior applications.

• IP66 — Dust-tight and protected against powerful water jets. Specified for wash-down environments (food processing, commercial kitchens, swimming pools).

• IP67 — Dust-tight and protected against temporary immersion (up to 1m depth). Used for in-ground luminaires and areas subject to flooding.

• IP68 — Dust-tight and protected against continuous submersion. Specified for underwater lighting (pools, fountains).

Common IP Ratings by Application

Practical guidance for UK commercial specifications:

• Offices, classrooms, retail (dry interiors) — IP20 is sufficient for recessed and suspended luminaires. IP40 for track spots and downlights.

• Bathrooms and washrooms — Zone 0 (inside bath/shower): IP67 minimum. Zone 1 (above bath/shower to 2.25m): IP44 minimum (IP65 recommended). Zone 2 (0.6m from Zone 1): IP44 minimum.

• Commercial kitchens — IP65 minimum, IP66 for areas subject to direct hose-down cleaning.

• Car parks (covered) — IP65 for open-sided multi-storey car parks. IP54 may suffice for fully enclosed underground car parks.

• Industrial/warehouse — IP65 for general industrial. IP66 for food processing and wash-down areas. IP65 minimum for any space with dust, moisture or temperature variations.

• Exterior — IP65 minimum for wall-mounted, floodlights and bollards. IP66 for coastal or highly exposed locations. IP67 for in-ground uplights.

• Clean rooms — IP65 minimum with smooth, sealed housings that can be wiped clean.

• Healthcare — IP44 minimum for clinical areas. IP65 for utility and plant rooms.

• Cold stores and swimming pool surrounds — IP65 minimum. Underwater lighting — IP68.

BS 7671 (IET Wiring Regulations) and the relevant luminaire standard (BS EN 60598) define the minimum IP ratings required for each installation zone.

IP Ratings and IK Ratings

IP ratings are often specified alongside IK ratings, which measure impact resistance on a scale of IK00 (no protection) to IK10 (20 joules — equivalent to a 5kg mass dropped from 400mm). For environments where luminaires are subject to physical impact — vandal-prone public areas, sports halls, custodial facilities — both IP and IK ratings should be considered.

Common IK requirements:

• IK02-IK04 — Standard interior environments • IK06-IK07 — Car parks, corridors, communal areas • IK08 — Schools, sports halls • IK10 — Custodial, anti-vandal, high-risk public areas

EOS offers a comprehensive range of IP65 / IK10 rated luminaires for demanding environments, combining weatherproof sealing with heavy-duty impact resistance.

IP Testing and Certification

IP ratings must be independently tested and certified to BS EN 60529 (IEC 60529). Testing involves:

• Dust testing — the luminaire is placed in a sealed chamber filled with talcum powder circulated under negative pressure for 8 hours. Any dust ingress inside the enclosure constitutes a failure for IP6X.

• Water testing — varies by rating: IP X4 (splash test from all directions), IP X5 (6.3mm nozzle at 12.5 litres/min from 3m), IP X6 (12.5mm nozzle at 100 litres/min from 3m), IP X7 (immersion at 1m for 30 minutes).

All EOS luminaires are tested by accredited laboratories and carry valid IP certification documentation available on request. Gasket materials, cable gland specifications and diffuser sealing methods are critical to maintaining IP ratings throughout the product's operational life.

Specifying IP Ratings: Common Mistakes

Avoid these frequent specification errors:

1. Over-specifying — requesting IP65 for dry office environments adds cost without benefit. Match the rating to the actual environmental conditions.

2. Ignoring IK ratings — IP rates ingress protection, not mechanical impact. For car parks, sports halls and custodial environments, also specify an IK rating (IK08 or IK10 for vandal-resistance).

3. Forgetting cable entries — the IP rating only applies when the luminaire is correctly installed with sealed cable glands. Poorly terminated cable entries will compromise any IP rating.

4. Assuming IP ratings are additive — IP65 does not mean the luminaire has IP6x AND IPx5 protection tested separately. The complete code is tested as a combination.

5. Neglecting maintenance — gaskets and seals degrade over time. Luminaires in harsh environments should be inspected periodically and gaskets replaced if necessary.

EOS provides full IP and IK rating data on all product datasheets, and our specification team can advise on the correct rating for any application.