Quality inspections and laboratories

Despite the increasing prevalence of automated work processes, the human eye is still superior in spotting flaws and irregularities on product surfaces. Properly performed quality inspections depend on the right supplementary light.
The general illumination of a factory building is often not enough to determine the quality of goods in production. Also, building structures may overshadow inspection sites. The lighting therefore needs to be tailored to the products being inspected – their surface structure, colour, reflections, size and the time taken to inspect them.

Two lighting concepts stand out: a diffuse, uniform and shadow-free light that allows inspection of matt, shiny or transparent objects, or a directional light from one or more angles that creates modelling shadows making it easier to identify scratches or cracks on surface structures. The former could be achieved by using pendant or surface mounted luminaires at a distance from the work area, to secure a high uniformity. The latter by means of an arm-based task light or luminaires closer to the inspection area. Luminaires with a higher colour rendering may be required for colour comparisons.

For inspection of tiny objects such as for example circuit board components, a magnifying luminaire is the best option. Arm-based magnifiers with square shaped lenses that can switch the light on from both sides of the item being examined, cast modelling light, making the components stand out and errors easier to identify. In the electronics industry, ESD luminaires prevent electrostatic discharges to damage the goods.

Lighting requirements in EN 12464-1



For chemical industry and textile manufacture and processing

Type of area, task or activity
 Lux-level (Em)
Glare rating (UGRL
 Uniformity
(U0)
 Colour rendition
(Ra)
 Specific requirements
Colour inspection
1 000
16
0,70
90
4 000 K <CCT < 6 500 K
Cutting, finishing, inspection  750 19 0,70 80  


For food industry

Type of area, task or activity
 Lux-level (Em)
Glare rating (UGRL
 Uniformity
(U0)
 Colour rendition
(Ra)
 Specific requirements
Laboratories
500
19
0,60
80



For electrical and electronics industry

Type of area, task or activity
 Lux-level (Em)
Glare rating (UGRL
 Uniformity
(U0)
 Colour rendition
(Ra)
 Specific requirements
Electronic workshops, testing, adjusting
1 500
16
0,70
80



For metal working and processing

Type of area, task or activity
 Lux-level (Em)
Glare rating (UGRL
 Uniformity
(U0)
 Colour rendition
(Ra)
 Specific requirements
Scribing: inspection
750
19
0,70
80



For wood working and processing

Type of area, task or activity
 Lux-level (Em)
Glare rating (UGRL
 Uniformity
(U0)
 Colour rendition
(Ra)
 Specific requirements
Quality control, inspection
1 000
19
0,70
90
4 000 K < CCT < 6 500 K


For vehicle construction and repair

Type of area, task or activity
 Lux-level (Em)
Glare rating (UGRL
 Uniformity
(U0)
 Colour rendition
(Ra)
 Specific requirements
Final inspection
1 000
19
0,70
80



For rolling mills, iron and steel works

Type of area, task or activity
 Lux-level (Em)
Glare rating (UGRL
 Uniformity
(U0)
 Colour rendition
(Ra)
 Specific requirements
Test, measurement and inspection
500
22
0,60
80



Products »