COMMENT
How lighting concepts can enhance enclosure aesthetics and functionality
A status LED flashing behind a smoked lens, a control panel that glows faintly in a darkened plant room, a handheld instrument’s grip lights up so it can be found in the dark. All these illumination effects are the result of enlightened decisions made early in the enclosure specification process, often before the PCB layout is finalised.
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nclosure lighting shouldn’t be an afterthought late in development. It’s important because it tells the user what state a device is in and helps them to operate it safely in poor light. Colourful light is also an elegant way to enhance aesthetics. Radiating lines and backlit surfaces are frequently used to create visual highlights, enhance perceived quality and add distinctive accents. There are four main methods: light guides, LED-based optoelectronic components, illuminated lines and backlit surfaces.
A light guide is a moulded transparent plastic element that channels light from a PCB-mounted LED to a specific point on the housing surface, often around corners. It decouples LED placement from the position of the indicator on the enclosure face, so you have far more freedom with your PCB layout. This makes light guides the natural choice for status indicators or anything that needs to visualise a discrete operating condition clearly and efficiently with minimal light loss. Some light guide designs go further, distributing light evenly along their full length rather than at a single point. This suits applications that need a uniform, glare-free glow across a larger area; it opens up a wide range of design, colour and visual effects possibilities.
An optoelectronic component, such as an LED, lamp or display mounted through an aperture, places the light source at the point of use. This is the simplest and most direct route to a functional indicator. It also offers higher-brightness signalling (that a light guide would attenuate) or multi-colour illumination (that a single light guide would struggle to reproduce cleanly).
Optoelectronic components are a pragmatic, cost-effective option but your board layout has to accommodate the illumination source at exactly the right spot in relation to the enclosure.
Illuminated lines and backlit surfaces offer
different illumination effects compared with light guides and optoelectronic components. Instead, translucent sections of the housing (or dedicated inserts such as intermediate rings) are lit from behind using energy-efficient LEDs. This creates a glowing edge or panel, rather than a point of light.
The primary driver is often visual: a distinctive design accent, a perception of quality, a brand-colour highlight, but there is also a functional case too. Backlighting improves orientation in low-light environments and supports colour-coded status at a glance. And because the light passes through solid, translucent housing material (rather than through an aperture), backlighting can also be achieved without breaching the enclosure wall. This helps to preserve the housing’s ingress protection rating. Getting the backlighting right depends heavily on material
22 OCTOBER 2026 | ELECTRONICS FOR ENGINEERS
selection, surface finish and light source choice, since uneven diffusion or hotspots can undermine the effect. So it pays to get advice from an enclosure specialist like OKW. OKW has unveiled a number of lighting concepts to help inspire electronics designers. Examples include a customised 3D-printed component with integrated LED strip to replace the standard TPE handle on its CARRYTEC handheld enclosures. Meanwhile, a 3D-printed intermediate ring could help add illumination to models such as EVOTEC, EASYTEC, SMART-BOX and SLIM-CASE. OKW marketing director Robert Cox said: “If you need a clear, low-ambiguity status signal on a tight PCB layout, specify a light guide. If your LED placement already aligns with the housing feature and you need a cost-effective indicator, a direct optoelectronic component will do the job without added complexity. “If the goal is ambient illumination, brand differentiation or safe operation in dim conditions, then consider illuminated lines or backlit surfaces, but they can demand more attention to materials and light distribution to look genuinely well finished. In practice, many products combine more than one method: a light guide for status and a backlit ring or edge for orientation and design appeal,” he added. Ultimately, the right illumination choice is rarely obvious from a datasheet. It comes from understanding what the light needs to communicate, where on the housing it needs to appear and how that constrains (or frees up) your PCB layout. Get that conversation right early on and illumination becomes part of the enclosure’s engineering, rather than a late addition.
For more information, view the OKW website:
https://www.okw.co.uk/en/news/blog/ BLG2610-illumination.htm
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