Last June, Brandenburg recorded temperatures of up to 41.7 degrees Celsius, pushing data centres and office buildings to their operational limits. That extreme heat has exposed a contradiction many companies are only now grappling with: the very sunscreens they install to keep workplaces cool can damage employees’ eyesight.
Shutters and blinds effectively block heat and cut glare on monitors. But they also degrade natural light quality—especially the distribution of brightness and contrast across a room. Experts call it the “jalousie paradox.” Because visual performance at a desk depends on balanced illumination, firms are being urged to audit their office lighting under real summer conditions. Technical guidelines such as Germany’s workplace regulation ASR A3.4 (Lighting) and the DGUV Information 215-211 spell out how workspaces must be lit. Poor planning, safety specialists warn, leads to early fatigue and concentration lapses.
As workplace regulations tighten around heat, lighting and visual health, documenting your risk assessments is more important than ever. Many employers overlook gaps in their safety paperwork—until an inspection or incident reveals them. A free toolkit with 41 ready-to-use checklists and templates helps you identify hazards and stay compliant from fire safety to lone working. Download the free Risk Assessment Toolkit
To help reduce indoor heat loads, the federal government offers financial incentives. Through the Federal Funding for Efficient Buildings (BEG EM), external shading systems qualify for grants. The base subsidy is 15 percent, with a minimum investment of 300 euros. Per residential unit, up to 30,000 euros of costs are eligible—if the property has an individual refurbishment roadmap (iSFP), that limit doubles to 60,000 euros, plus an extra 5-percent bonus.
The issue has also reached the courts. In mid-June 2026, the Higher Administrative Court of Lower Saxony declared a development plan invalid because the shadow cast by a new building in a protected waterfront area had not been adequately assessed (Case No. 1 KN 73/24). The ruling signals that planners and companies must now calculate shading effects in detail during the design phase.
Hardware makers are responding with brighter displays. A leading manufacturer recently launched a 39-inch OLED monitor that delivers a peak HDR brightness of 1,500 nits and covers 99.5 percent of the DCI-P3 colour space. Notebooks are following suit: new models feature 3K OLED panels with 1,000 nits of HDR luminance. These high peak brightnesses aim to keep screen content legible even when sun-control measures distort natural light distribution.
Beyond hardware, eye health prevention is gaining attention. During screen work, the blink rate drops to just five to seven blinks per minute, causing dry eyes. Air conditioning and high UV exposure worsen the problem. The skin around the eyes is only 0.3 to 0.5 millimeters thick, making it vulnerable. Experts recommend ingredients such as hyaluronic acid, peptides, and antioxidants in eye-care products.
In early July, a Belgian specialist presented a four-stage cooling model. The first and most effective step is external solar shading to cut heat entry; active cooling is reserved as a last resort. The approach reflects a broader shift from reactive air conditioning to integrated design—one that balances thermal comfort with the visual health of the workforce.
