---
title: "Xingguang | Asymmetric optic floodlight | LED Lighting"
description: "An asymmetric optic exists because you do not want light wasted behind the fixture: wall-mounted or at the edge of a yard, a symmetric optic puts half its flux on the wall or outside the site — not counted in the illuminance table, still paid for on the electricity bill."
url: "https://www.xingguanglightingcn.com/en/spec/floodlight-asymmetric-optic"
lang: "en"
updated: "2026-10-28"
markdown: "https://www.xingguanglightingcn.com/en/spec/floodlight-asymmetric-optic.md"
---

[Home](https://www.xingguanglightingcn.com/en/) / [Selection by specification](https://www.xingguanglightingcn.com/en/spec/) / Asymmetric optic floodlight

# Asymmetric optic floodlight

An asymmetric optic exists because you do not want light wasted behind the fixture: wall-mounted or at the edge of a yard, a symmetric optic puts half its flux on the wall or outside the site — not counted in the [illuminance](https://www.xingguanglightingcn.com/en/glossary#illuminance) table, still paid for on the electricity bill. The price is that the direction cannot be adjusted, so the mounting angle has to be right first time.

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## Key parameters

| Power | 100–200 W |
| --- | --- |
| Mounting height | 6–10 m |
| IP rating | IP66 |
| Beam angle | 30° × 70° |
| Distribution type | Asymmetric (forward throw) |

[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 on the floor, purely because of distribution. This page is Asymmetric (forward throw). 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 30° × 70° at 6–10 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)[Unified glare rating](https://www.xingguanglightingcn.com/en/glossary#ugr)

![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/)