Electronics and semiconductors

Lighting for the cleanest rooms, from ISO 3–4 microelectronics to assembly areas, fitted around laminar-flow filter ceilings.

A bright white production room with rows of flush ceiling panels and a polished floor

The problem

Semiconductor and microelectronics cleanrooms work at ISO 3 to ISO 5, where a single particle can ruin a wafer. Filter fan units often cover most of the ceiling to give unidirectional airflow, leaving little room for recessed lighting, and anything that disturbs the airflow or sheds particles is a problem. Precision assembly and testing also need high light levels with low glare, and photolithography areas need light with no short-wavelength content.

How lighting helps

Use luminaires intended for the room's class: frameless, sealed panels for ISO 3–4, or linear luminaires with streamlined profiles that fit the grid between filter units and reduce disturbance to the airflow. EN 12464-1 sets 1,000 lx for precision assembly and 1,500 lx for electronics testing and adjusting, so calculate with real photometric data and allow for the filter layout. For lithography, yellow-light versions remove the blue content that would expose photoresists. Low-UGR panels help where people work at screens and microscopes.

Get the filter fan unit layout before planning any lighting
Use linear luminaires between filter units where recessed panels won't fit
Confirm the wavelength cut-off your lithography process needs before choosing yellow light
Check uniformity carefully: filter housings and deep grid members cast shadows