一種新型照明燈具有兩套光學系統，設計用于改善手術室的工作環境并增加效率。

這種照明燈叫做Stella，一個照明燈內具有兩套光學系統。兩套系統連接在一個光學軸上，具有各自的透鏡、濾光器、以及反射鏡。獲得的系統聯合使用鹵素和氣體放電技術。當氣體放電燈產生大面積、無陰影照明的時候，鹵素燈提供附加的高對比深度的照明。結果，這套系統能夠均勻照射傷口環繞區域和傷口內部，產生有立體感的視野，盡可能的防止陰影產生。

兩套光學系統的均勻一直的色溫，4200開氏溫標，產生了最佳的顏色識別環境，使得每層組織彼此之間更加容易識別。新型控制設計考慮了單個外科醫生的需求，允許外科醫生通過常數、均一的光柱來設置最佳照明效果，使用安置在燈泡體部的可消毒的手柄來調節照明深度。Stella同時還能夠適應分離消毒和非消毒區域的要求，可以將方案效率最佳化，滿足手術之前和之中的衛生要求。

Stella是由德國Draeger Medical AG研制開發的，該公司在2005年5月維也納召開的歐洲麻醉學學會年會上介紹了這套產品。
 
Novel Lighting System for Operating Room
 
A new lamp that combines two optical systems is designed to improve working conditions and increase efficiency in the operating room (OR).

Called Stella, the lamp has two optical systems in a single body. These are joined on an optical axis, each with its own lens, filters, and reflectors. The patented system combines halogen and gas-discharge technology. While the gas discharge lamp generates large-area, shadow-free illumination, the halogen lamp provides an additional high-contrast depth illumination. As a result, the system is able to evenly illuminate both the area surrounding a wound and deep into the situs, supporting stereoscopic vision and preventing bothersome shadows from occurring as much as possible.

The identical color temperature of both light systems, 4200 Kelvin, creates conditions for optimal color recognition and makes tissue layers more easily distinguishable from each other. The new control design takes into account the demands of the individual surgeon by allowing the surgeon to set the optimal luminance by the constant, homogenous light cylinder and to adjust the depth of illumination using a sterilizable handgrip located on the body of the lamp. The Stella concept also accommodates the necessity to better separate sterile and nonsterile areas in order to optimize the efficiency of procedures and hygienic requirements before and during an operation.

Stella was developed by Draeger Medical AG (Lubeck, Germany), which introduced the unit at the annual meeting of the European Society of Anesthesiology (ESA) in Vienna (Austria) in May 2005.