---
title: "Xingguang | 20W Tri-Proof Lights | LED Lighting"
description: "A 20 W tri-proof light is mostly a corridor, stairwell and service-void fixture: what matters there is that it keeps working, not how bright it is. The lens is the real choice — an opal diffuser keeps glare down so people can walk a low corridor without looking away…"
url: "https://www.xingguanglightingcn.com/en/spec/tri-proof-20w"
lang: "en"
updated: "2026-10-28"
markdown: "https://www.xingguanglightingcn.com/en/spec/tri-proof-20w.md"
---

[Home](https://www.xingguanglightingcn.com/en/) / [Selection by specification](https://www.xingguanglightingcn.com/en/spec/) / 20W Tri-Proof Lights

# 20W Tri-Proof Lights

A 20 W [tri-proof light](https://www.xingguanglightingcn.com/en/glossary#tri-proof) is mostly a corridor, stairwell and service-void fixture: what matters there is that it keeps working, not how bright it is. The lens is the real choice — an opal diffuser keeps [glare](https://www.xingguanglightingcn.com/en/glossary#ugr) down so people can walk a low corridor without looking away; a clear one at the same wattage is hard to look up at.

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## [Key parameters](https://www.xingguanglightingcn.com/en/glossary#efficacy)

| Power | 20 W |
| --- | --- |
| Efficacy | 130 lm/W |
| Luminous flux | 2,600 lm |
| Maintained flux | 1,820 lm |
| Mounting height | 2.5–3.5 m |
| Coverage per fixture | 6–8 m² |
| Design illuminance | 200–300 lx |
| HID equivalent | 1 × 36 W |

[Product family: Tri-Proof Lights](https://www.xingguanglightingcn.com/en/product-categories/tri-proof)

## What the wattage figure does not tell you

At 130 lm/W, 20 W gives about 2,600 lm at the fixture; applying a 0.7 maintenance factor, roughly 1,820 lm reaches the floor at end of life. Layout counts come from 1,820 lm, not from the nameplate 20 W — layout by wattage and the far row always ends up dim.

A second double count: the 130 lm/W figure already includes driver losses. Discounting again by driver efficiency deducts the same loss twice and over-counts fixtures.

## The height and area it actually covers

At 2.5–3.5 m and a design illuminance of 200–300 lx, one 20 W fixture covers about 6–8 m². That range is back-calculated from the maintained 1,820 lm, not the initial output — lay out on initial lumens and the site is under-lit well before the first relamping cycle.

If the existing HID is 1 × 36 W, 20 W lands in the same bracket: comparable flux, roughly a third of the power draw, and the circuit and switchgear usually carry over. What to re-check is inrush current and the earth-leakage setting.

## 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.

## Concepts on this page

[Tri-proof light](https://www.xingguanglightingcn.com/en/glossary#tri-proof)[Unified glare rating](https://www.xingguanglightingcn.com/en/glossary#ugr)[IP rating](https://www.xingguanglightingcn.com/en/glossary#ip-rating)

![Tri-Proof Light TP-101](https://www.xingguanglightingcn.com/assets/img/prod-tp101.webp)

### [Tri-Proof Light TP-101](https://www.xingguanglightingcn.com/en/products/tri-proof-101)

Tri-proof

## Need a Lighting Plan?

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[All specification pages](https://www.xingguanglightingcn.com/en/spec/)