Industrial Lighting Specifications Explained

Lighting specifications at a glance

Start with the parameter you need to check. Each value answers a different question; no single rating establishes whether a luminaire is suitable for your project.

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Definitions: CIE photometric vocabulary, DOE LED Basics and IEC 62262 Amendment 1. Use the sections below to interpret their limits.

Power, light output and efficacy

Watts describe electrical input. Lumens describe light output. To compare energy performance, divide the complete luminaire’s light output by its total electrical input:

Confirm the measurement boundary. A value for an LED package is not the same as a value for the assembled luminaire, which includes its driver and optical system. CIE’s efficacy definition explicitly requires clarity about auxiliary power; DOE distinguishes source efficacy from luminaire efficacy.

Worked comparison: the same lumens, different watts

The following figures are hypothetical teaching values, not TORMIN product specifications.

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Example A uses less power for the stated output. This does not establish that it delivers the same illuminance, uniformity or visual comfort in a real installation. Before treating the products as alternatives, compare their distribution, mounting arrangement, color specification and operating conditions.

When reviewing a quotation, ask: “Are these lumens and watts for this exact luminaire configuration, measured under the same conditions?”

Illuminance: check the surface that matters

Illuminance describes light incident on a surface and is expressed in lux. CIE defines 1 lx as 1 lm/m². A luminaire’s lumen rating alone cannot tell you the lux at a workbench, floor or vertical inspection surface.

For a project comparison, request a lighting calculation using the proposed model’s IES or LDT photometric file. Record:

• Task and assessment plane: where people need to see, including the plane’s height and orientation.
• Geometry: mounting height, spacing, aiming and obstructions.
• Calculation assumptions: surface reflectances and the maintenance assumptions used.
• Acceptance criteria: required maintained illuminance, uniformity and applicable glare criteria for the project.

Do not divide the total catalogue lumens by floor area and present the result as a verified lighting design. That shortcut does not establish how much light reaches each assessment point. Keep product output and installation performance as separate lines in your comparison.

CCT and CRI: two different color questions

CCT: what does the light look like?

Correlated color temperature, in kelvin, relates a light source’s chromaticity to that of a reference thermal radiator. In practical white-light comparisons, lower values usually look warmer and higher values cooler. It is not the operating temperature of the fixture. CIE: correlated color temperature.

Specify the numeric CCT rather than relying only on labels such as “warm white” or “cool white.” For a replacement within an existing installation, check the required consistency with neighboring luminaires. A CCT value alone does not establish lumen output, efficacy or color fidelity.

CRI: how faithfully are object colors rendered?

CRI is commonly reported as Ra. It summarizes color fidelity using a defined set of test colors; it is not a percentage of colors reproduced correctly. The general index uses eight samples, so a single Ra value does not describe every color response. CIE: CRI test samples.

For sorting colored components, inspecting coatings or judging surface appearance, identify the actual visual task before specifying a minimum value. Where color decisions are critical, ask for the relevant color data and review representative materials under the proposed lighting.

In its 2025 position statement, CIE recommends transitioning to the general color fidelity index Rf, with Ra and Rf reported together during the transition. They are distinct metrics: retain the metric named in the project specification rather than silently substituting one for the other. CIE PS 002:2025.

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IK ratings: mechanical impact protection

The IK code classifies enclosure protection against external mechanical impacts under specified test conditions. The energy values below follow the amended table in IEC 62262:2002/AMD1:2021. IEC publication record; amendment preview, Table 1.

Use this as an energy lookup, not a field drop-test procedure or a promise of resistance to every collision. Confirm which parts and configuration the rating covers, including the lens or guard where applicable. An unreported IK rating is not automatically IK00.

Keep IK, IP and explosion protection separate

• IK: mechanical-impact classification under IEC 62262.
• IP: enclosure protection under IEC 60529, addressing access to hazardous parts and ingress of solid objects and water.
• Explosion protection: suitability established through the applicable hazardous-area framework and exact equipment documentation.

An IK or IP rating does not establish hazardous-area approval. See IEC 60529 for the IP framework and TORMIN’s nameplate and certificate guide for the separate document check.

Before you compare or replace a luminaire

Build a comparison around the exact ordering code. Put each quoted value beside its evidence, and leave unconfirmed fields open for clarification.

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Treat matching watts, a similar shape or one higher rating as a starting point for review—not proof of interchangeability. For hazardous areas, follow the separate explosion-proof lighting selection guide.

Need the documentation for a TORMIN model? Contact TORMIN with the full model reference, destination market and project requirements. For delivery, warranty and order questions, use the existing FAQ.

Sources

• CIE — International Lighting Vocabulary, CIE S 017:2020: terminology reference; specific entries linked below.
• US Department of Energy — LED Basics: source versus luminaire efficacy and color-quality distinctions.
• CIE — Luminous efficacy of a light source, 17-21-089: ratio, units and auxiliary-power boundary.
• CIE — Illuminance, 17-21-060: incident flux per area and lux.
• CIE — Correlated color temperature, 17-23-068: CCT definition and kelvin unit.
• CIE — Spectral radiance factors of CRI test samples: eight samples used in the general index, from CIE 13.3:1995.
• CIE — Position Statement on Colour Quality Metrics, 2nd edition, 2025: parallel reporting of Ra and Rf during the recommended transition.
• IEC — IEC 62262:2002/AMD1:2021, with Table 1 in the SIST-hosted IEC amendment preview: IK classification and amended impact-energy values. This is a preview, not a review of the complete consolidated standard.
• IEC — IEC 60529:1989+AMD1:1999+AMD2:2013: official publication record for the IP enclosure-protection framework.