Underground car park lighting

Key parameters

Power	18–40 W
Luminous flux	2,300–5,200 lm
IP rating	IP65
Impact rating	IK08
Operating temperature	-5 … +40 ℃

Product family: Tri-Proof Lights

Environment is not only about water

What actually kills fixtures on site, in order of how often it happens: ① heat — every 10 ℃ of chamber temperature roughly halves driver life; ② corrosive gas or salt fog — it eats the screws and the coating first and enters through the seam afterwards; ③ dust — it blocks the fins, which is heat again; ④ cold — capacitors struggle to start and plastics go brittle. IP covers only the water part.

So the order of questions should be: what is the ambient temperature, is there a corrosive medium, how is dust cleaned, what is the minimum temperature — and IP last. Reverse the order and the fixtures start failing three months in, with a perfectly adequate IP rating.

How to check the temperature item

This page is rated -5 … +40 ℃. Note that this is the ambient temperature the fixture tolerates, not the body temperature — the two differ by the temperature rise. What the driver sees is ambient plus rise, and the rise comes from heatsink area: same wattage, different construction, 20 ℃ apart.

The check is simple: ask for the driver model, then read its derating curve at the actual chamber temperature. A quote that cannot produce that curve has not answered the temperature question, whatever the ℃ figure says.

Four things to verify before ordering

① Whether flux and efficacy are quoted for the complete fixture or the light source — a 10–15% difference that changes the fixture count. ② Whether colour temperature and CRI are measured or nominal values; mixed CCT within one batch is the most common arrival dispute. ③ Driver brand and model, plus its derating curve at high temperature — it is the only part that really sets life. ④ The mounting kit list: chain, bracket and anchors in the box, or the site stops for a day.