In addition to visual acuity, lighting also affects employees’ sense of well-being, performance capacity, and concentration (number of assembly errors and workplace accidents). The work bench system must therefore be able to accommodate optimum lighting.
What is needed, therefore, is a broad spectrum of different lamp types (such as spotlights, magnifying lamps) and equipment that can be used to position and direct these lamps.
Lighting intensity should be adjusted individually to the process and the employee. It is also a good idea to consider energy use when mapping out the overall lighting concept.
Having a lot of shadow on the working surface is disruptive and affects concentration. Largely low-shadow illumination should be preferred. This is achieved by using as few different lamps as possible, ideally with diffuse lighting.
Parabolic reflector grids or microprisms can be used with optimum directionality to reduce direct glare. Indirect glare due to reflective surfaces in the work environment, including the workpiece itself, should also be taken into account.
Flickering is often apparent and perceived as disruptive, especially in the case of simple lighting using florescent tubes. Lights with electronic lamp control units can help with this.
In most cases, a neutral white color temperature (3300K–5300K) is considered the best setting. The requirements this involves with regard to the process should be taken into account in all cases.
General assembly activities call for a light intensity of about 46.5 fc (500 lux). If the components are very small, the assembly is complicated, or high levels of joining precision need to be achieved, the requisite lighting intensity can be as much as 100 to 139.4 fc (1000 to 1500 lux).
Required light intensity according to industry standard DIN EN 12464:
|Activity||Light intensity in foot-candles (fc)||Light intensity in lux|
|Rough assembly work||18.6||200|
|Moderately detailed assembly work||27.9||300|
|Detailed machining and assembly work||46.5||500|
|Highly detailed assembly work||69.7||750|
|Precision mechanics and micromechanics||100-139.4||1000 – 1500|
When considering lighting, a person’s individual visual acuity should also be taken into account. This may vary between individual employees. The physical circumstances within the space are another factor.