Specifier’s guide

IP ratings for outdoor lighting in India

Most outdoor lighting that fails in India does not fail because the IP rating was too low. It fails because the rating was read as a promise it never made.

What the two digits actually mean

An IP code has two digits. The first is protection against solids, the second against water. Each is a separately defined laboratory test under IEC 60529.

Code	The actual test
IP5X	Dust-protected. Dust may enter, but not enough to interfere with operation
IP6X	Dust-tight. No ingress at all
IPX4	Splashing water from any direction
IPX5	A 6.3 mm nozzle, 12.5 litres/minute, from 3 m, at least 3 minutes
IPX6	A 12.5 mm nozzle, 100 litres/minute, from 3 m, at least 3 minutes
IPX7	Immersion in 1 m of water for 30 minutes
IPX8	Continuous immersion, deeper than IPX7 — at conditions agreed between manufacturer and user

Three things the rating does not tell you

1. The digits are not cumulative. IPX7 is an immersion test. IPX6 is a jet test. They are different tests, and passing one does not imply the other. An IP67 fitting has been immersed in still water — it has not been proven against a pressure washer or driving rain. If a fitting must meet both, it has to be rated for both.

2. IP68 is not a fixed standard. IEC 60529 does not define the IPX8 conditions. It requires only that they be more severe than IPX7, and that the depth and duration be agreed between the manufacturer and the user. So “IP68” alone is not a specification — always ask to what depth, and for how long.

3. A high IP rating does not predict long life. The test is performed once, on a new sample, in a laboratory, at room temperature. It says nothing about what the enclosure will be like after three monsoons and forty summers.

What actually kills outdoor fittings here

Monsoon, but not the way people think. The damage is rarely a single downpour. It is months of high humidity driving moisture through gaskets and cable entries, and the daily heating-and-cooling cycle that breathes damp air into the housing and condenses it there.
Salt, on any coast. Mumbai, Chennai, Goa, Kochi — airborne chloride attacks aluminium at coating defects and around fasteners. Stainless fixings and an intact powder coat matter more here than an extra IP digit.
Dust, before the rain. The pre-monsoon months load every surface. Dust on a diffuser costs output; dust packed into a heat sink costs thermal performance, which costs LED life.
Heat. The quiet one. LED lumen maintenance and driver life both fall as operating temperature rises, and electrolytic capacitors in drivers are especially temperature-sensitive. A fitting rated for a European summer is not automatically rated for a Nagpur one — ask for the ambient temperature range explicitly.
UV. Sunlight embrittles gaskets, yellows polycarbonate diffusers and cracks cable sheaths. A fitting can stay perfectly sealed and still lose its output to a clouded lens.

What to look at instead of the IP number alone

Housing and finish. Die-cast aluminium with proper pre-treatment before powder coating. The pre-treatment is what stops corrosion creeping under the coat from a chip.
Gaskets. Silicone holds its elasticity through heat and UV better than cheaper alternatives. A hardened gasket is how an IP66 fitting quietly becomes an IP44 one after two summers.
Cable glands. A properly torqued gland sized to the actual cable. The commonest real-world water path into an outdoor luminaire is the cable entry, not the lens seal.
Drainage, for anything in the ground. An in-ground uplight in a planter sits in standing water unless the pit drains. Specify the drainage detail, not just the fitting.
IK rating wherever fittings are reachable — bollards in car parks, in-ground units on a walkway.

A well-built IP65 fitting routinely outlives a poorly-built IP68 one. The rating describes one test on one day. The construction describes the next ten years.

What we specify, where

Application	Rating	Note
Bollards, gate lights, pole lights	IP65	Jet-protected — the sensible baseline for anything rain-exposed
Solar street lighting	IP66	Higher jet rating; these sit exposed with no maintenance visit
Outdoor and landscape range	IP54 · IP65 · IP67	Varies by model — check the specific fitting
Underwater	IP68	Pools, fountains, water features. Runs on 12 V DC; the supply is ordered separately
Anything indoor	IP20	Includes magnetic track and strip — not for outdoor use

On CRI outdoors. Our outdoor ranges are Ra 70+ as standard, with Ra 80+ available on request. That is deliberate, not a corner cut: over asphalt, concrete and planting, lumens per watt buys more useful light than colour fidelity does. Where an outdoor scheme lights a façade or a hotel entrance and colour genuinely matters, ask for 80+.

Five mistakes worth avoiding

Reading IP67 as “better than IP65”. For rain and washing down, IP65 or IP66 is the relevant test. IP67 is about immersion.
Accepting “IP68” without a depth. The standard requires the conditions to be agreed. Ask what they were.
Specifying by IP alone on the coast. Material, finish and fixings decide it there.
Forgetting the pit drains. In-ground fittings sit in whatever the pit holds.
Ignoring ambient temperature. Heat shortens both LED and driver life, and it is the failure nobody attributes correctly.