Tunnels, once the silent "functional passages" in the city, have now, empowered by light and shadow technology, become a new carrier for culture, education, and technology. DHN has assisted its partners in the implementation of the Shijiazhuang Civil Air Defense Tunnel project with a hundred projectors. This not only has refreshed the industry's imagination of tunnel scenarios but also, through benchmark-level application practices, demonstrated DHN's innovative strength in the application end of the engineering projection field. From technological breakthroughs to in-depth exploration of scenarios, DHN is redefining the value boundaries of tunnels.  

In the Shijiazhuang Civil Air Defense Tunnel project, DHN deployed over a hundred 5,000-lumen laser engineering projectors to build the first immersive light and shadow system in China that covers the entire tunnel. The DHN DU500ST projector adopts MCL laser light source and 3LCD light source display technology. With a light source lifespan of over 20,000 hours, it ensures the stable operation of the equipment in the high-humidity and dusty environment of the tunnel.

The core value of the Shijiazhuang Civil Air Defense Tunnel project lies in transforming national defense education into a perceivable immersive experience through technical means. By 联动 dynamic images with sound and light, various major historical scenes of China's national defense development are recreated on the tunnel walls, allowing visitors to intuitively feel the development context of national defense forces. In addition, there are a variety of interactive games available for visitors to experience, which greatly enhances the sense of experience and fun for tourists.

The success of the Shijiazhuang project stems from DHN's in-depth understanding of the pain points of tunnel scenarios and its design of systematic solutions. Its advantages are no longer confined to hardware parameters, but rather focus on scenario adaptation and ecological coordination.  

In various tunnel projects, DHN projectors have always demonstrated excellent performance. For example, in the cave projection project of Tianzhu Mountain Scenic Area in Shaanxi Province, DHN's 5,000-lumen laser engineering projectors were also used. Combining with the topographical features of the karst cave, through the dual-color wheel technology and high-color restoration algorithm, DHN projected dynamic light and shadow onto the surface of the stalactites, creating a light and shadow themed show in the karst cave of the scenic area. Additionally, the Haishan Time Tunnel in the Donghai Yunlang Scenic Area in Zhoushan has injected new light and shadow vitality into the originally monotonous tunnel, significantly increasing the visiting duration and the intention of tourists to visit. Coincidentally, DHN's 7,000-lumen laser projectors have also been applied to the "intelligent hole opening" link in the construction of the Shanghai Metro. The design drawings are projected onto the inner wall of the tunnel at a 1:1 ratio, reducing manual measurement errors and shortening the construction period by 30%. The equipment supports the remote control locking function, and a single controller can manage 9 devices, greatly reducing the situation of accidental touches caused by the chaos at the construction site.  

The practice of the Shijiazhuang Civil Air Defense Tunnel is not only a model for the implementation of technology but also the starting point for the reconstruction of the value of urban space: 1. Value Upgrade: Shifting from "cost-consuming" infrastructure to a "value-creating" space. For example, the Shijiazhuang project has driven an 18% increase in cultural and tourism consumption in the surrounding areas, achieving a win-win situation in both social and economic benefits. 2. Technological Upgrade: Using projection as an entry point, integrating technologies such as the Internet of Things and AI algorithms, turning the tunnel into a data node of a smart city. 3. Experience Upgrade: Through immersive interactive design, transforming one-way communication into deep participation, and stimulating the public's emotional resonance towards national defense, history, and technology. DHN, by utilizing light and shadow plus technology and achieving a comprehensive upgrade in terms of "value + technology + experience", has proven the possibility of the transformation of tunnels from "functional passages" to "emotional carriers". The significance of technological innovation does not lie in the piling up of parameters, but in whether it can activate the social value of the space. In the future, with the development of more cross-border integrations, whether it is national defense education in civil air defense tunnels, psychological healing in rehabilitation hospitals, or immersive experiences in commercial complexes, DHN's light and shadow technology is transforming the originally "silent corners" in the city into super light and shadow interfaces that convey culture, care, and innovation.