--- title: "Industrial lighting glossary | LED Lighting" description: "Industrial lighting glossary" url: "https://www.xingguanglightingcn.com/en/glossary" lang: "en" updated: "2026-10-28" markdown: "https://www.xingguanglightingcn.com/en/glossary.md" --- [Home](https://www.xingguanglightingcn.com/) / Industrial lighting glossary # Industrial lighting glossary The most expensive sourcing mistake is treating a parameter name as if it were the parameter. These twenty-four terms are the ones that actually come up in enquiry, comparison and acceptance. Each gets one definition you can quote as-is, and a link to the page that expands it. ## Light and electrical parameters Lumen lm Unit of luminous flux: the total visible light a fixture emits in all directions. [Read more](https://www.xingguanglightingcn.com/en/blog/high-bay-ceiling-height) Luminous efficacy lm/W Lumens delivered per watt consumed; the number that drives running cost. [Read more](https://www.xingguanglightingcn.com/en/blog/industrial-led-lighting) Illuminance lux Luminous flux landing on one square metre of surface; design targets are written in lux. [Read more](https://www.xingguanglightingcn.com/en/guides/guide-high-bay-selection) Correlated colour temperature CCT (K) The warm-to-cool appearance of white light, expressed in kelvin. [Read more](https://www.xingguanglightingcn.com/en/blog/high-bay-ceiling-height) Colour rendering index CRI (Ra) A zero-to-one-hundred score for how faithfully a light renders colour against a reference source. [Read more](https://www.xingguanglightingcn.com/en/blog/industrial-led-lighting) Unified glare rating UGR The lower the value, the less discomfort glare inside the field of view. [Read more](https://www.xingguanglightingcn.com/en/blog/sports-lighting) Colour consistency step SDCM Steps on the MacAdam ellipse; three steps or fewer keeps two fittings of the same CCT from visibly mismatching. [Read more](https://www.xingguanglightingcn.com/en/blog/high-bay-ceiling-height) ## Protection and environment IP rating IP A two-digit ingress code: the first digit covers solids and dust, the second covers water. [Read more](https://www.xingguanglightingcn.com/en/blog/tri-proof-ip66) Impact resistance IK Mechanical impact class under IEC 62262; IK08 to IK10 covers most industrial handling. [Read more](https://www.xingguanglightingcn.com/en/blog/explosion-proof-atex) Hazardous area zone Zone Zone 1 or 21 marks where an explosive atmosphere is likely, and it decides the fixture type. [Read more](https://www.xingguanglightingcn.com/en/blog/explosion-proof-atex) Ambient temperature rating ta The maximum ambient temperature at which a fixture's published ratings still hold. [Read more](https://www.xingguanglightingcn.com/en/blog/why-led-fail-saber-testing) Lumen maintenance L70 Hours until output falls to seventy per cent of its initial value; the more honest half of a lifetime claim. [Read more](https://www.xingguanglightingcn.com/en/blog/industrial-led-lighting) ## Industrial fixture types High bay High bay Suspended fixture for ceilings above roughly six metres: warehouse, workshop, sports hall. [Read more](https://www.xingguanglightingcn.com/en/product-categories/high-bay) Flood light Flood light A wide-beam fixture aimed at a surface or area rather than at a task point. [Read more](https://www.xingguanglightingcn.com/en/product-categories/floodlight) Tri-proof light Tri-proof A sealed batten rated against dust, water and impact; the default in food and wash-down areas. [Read more](https://www.xingguanglightingcn.com/en/product-categories/tri-proof) Explosion-proof light Ex-proof A fixture built so that an internal spark cannot ignite the surrounding atmosphere. [Read more](https://www.xingguanglightingcn.com/en/product-categories/explosion-proof) Tunnel light Tunnel An asymmetric fixture used in tunnel zones where entry brightness has to be stepped down. [Read more](https://www.xingguanglightingcn.com/en/product-categories/tunnel-airport) Cold storage light Cold storage A fixture rated for sub-zero ambient and repeated freeze and thaw cycling. [Read more](https://www.xingguanglightingcn.com/en/product-categories/cold-storage) Area and canopy light Area / canopy A surface or pole fixture for forecourts, car parks and petrol-station canopies. [Read more](https://www.xingguanglightingcn.com/en/product-categories/floodlight) ## Sourcing and compliance Minimum order quantity MOQ The minimum order quantity per model or per colour temperature, confirmed in writing. [Read more](https://www.xingguanglightingcn.com/en/faq) Full container load FCL Full container load; the unit that decides the ocean freight cost per fixture. [Read more](https://www.xingguanglightingcn.com/en/blog/bulk-container-lead-time) OEM and ODM OEM / ODM OEM prints your brand on an existing model; ODM also changes the design. [Read more](https://www.xingguanglightingcn.com/en/oem-private-label/) Neutral packing Neutral packing Plain cartons with no factory mark, so the goods can carry your own label. [Read more](https://www.xingguanglightingcn.com/en/blog/engineering-vs-oem-sourcing) SABER conformity platform SABER The Saudi online conformity platform; the lighting energy-efficiency standard behind it is SASO 2902. [Read more](https://www.xingguanglightingcn.com/en/blog/saudi-import-documents) ## Put these terms to work - [Selection guides](https://www.xingguanglightingcn.com/en/guides/) - [Engineering and bulk import](https://www.xingguanglightingcn.com/en/engineering/) - [Sourcing and compliance FAQ](https://www.xingguanglightingcn.com/en/faq)