---
title: "Xingguang | Area light distribution types I–V | LED Lighting"
description: "Type I–V describes the shape of the pool: I is narrowest (walkways), II/III the most common (yards and roads), IV throws forward (keeps the wall behind dark), V is fully symmetric (round areas)."
url: "https://www.xingguanglightingcn.com/en/spec/area-light-distribution-types"
lang: "en"
updated: "2026-10-28"
markdown: "https://www.xingguanglightingcn.com/en/spec/area-light-distribution-types.md"
---

[Home](https://www.xingguanglightingcn.com/en/) / [Selection by specification](https://www.xingguanglightingcn.com/en/spec/) / Area light distribution types I–V

# Area light distribution types I–V

Type I–V describes the shape of the pool: I is narrowest (walkways), II/III the most common (yards and roads), IV throws forward (keeps the wall behind dark), V is fully symmetric (round areas). The symptom of the wrong type is a bright spot under the fixture and dark corners, which more fixtures will not fix because the light never goes there.

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## Key parameters

| Power | 100–300 W |
| --- | --- |
| Mounting height | 6–12 m |
| IP rating | IP66 |
| Beam angle | Varies by type (I narrowest, V symmetric) |
| Distribution type | IES Type I–V |

[Product family: Floodlights](https://www.xingguanglightingcn.com/en/product-categories/floodlight)

## The distribution decides where the light goes

Two fixtures with the same wattage and the same flux can put a twofold different [illuminance](https://www.xingguanglightingcn.com/en/glossary#illuminance) on the floor, purely because of distribution. This page is IES Type I–V. Distribution decides three things: the shape of the pool of light, how much of the flux reaches the floor, and whether the spacing can be opened up.

A common misjudgement is comparing distributions by centre illuminance. A narrow beam usually wins at the centre point and loses badly at the edges, giving a lower average. Compare average illuminance plus uniformity (minimum over average) — those two numbers match what people actually see.

## Angle and height come as a pair

This page is Varies by type (I narrowest, V symmetric) at 6–12 m. The direction is unambiguous: the higher the ceiling, the narrower the optic, or the light lands on the walls; the lower the ceiling, the wider the optic, or the floor gets discrete bright spots and hard shadows under each fixture.

Rule of thumb: pool diameter ≈ 2 × height × tan(half angle). At 10 m, 90° gives about 20 m and 60° about 11.5 m. Sketch the layout with that first and ask for a photometric calculation second — the other order usually costs a revision.

## Four things to verify before ordering

① Whether flux and [efficacy](https://www.xingguanglightingcn.com/en/glossary#efficacy) are quoted for the complete fixture or the light source — a 10–15% difference that changes the fixture count. ② Whether [colour temperature](https://www.xingguanglightingcn.com/en/glossary#cct) 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

[Flood light](https://www.xingguanglightingcn.com/en/glossary#flood-light)[Illuminance](https://www.xingguanglightingcn.com/en/glossary#illuminance)[Area and canopy light](https://www.xingguanglightingcn.com/en/glossary#area-canopy)

![Floodlight FL-160](https://www.xingguanglightingcn.com/assets/img/prod-fl160.webp)

### [Floodlight FL-160](https://www.xingguanglightingcn.com/en/products/floodlight-160)

Flood

## Need a Lighting Plan?

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