I think the term "非投射光源" in the text refers to light sources that do not directly shine on the "光线式安全装置", including natural light sources such as moonlight, star light, and random light sources like city and transportation light sources. There seems to be 2 options, one is the more literal "non-projected light sources" and another is just "random light sources."

Below are searches on "投射光源" and "projected light [source]"

光影與質感- 光源与阴影- 中国数字艺术在线论坛- CGBlog.com.cn- [ Translate this page ]投射光源：由光源向某方向照射，有一定的照射範圍。越接近範圍中心則光線強度越強，照常理其強度亦應隨距離而縮減，但有些系統允許自行設定。 ...
bbs.cgblog.com.cn/thread-13988-1-1.html - 59k - Mar 11, 2007 - Supplemental Result - Cached - Similar pages

15款便携型投影机横向评测- [ Translate this page ]当投影机工作时，投影灯泡发出的光线会经过一个高速旋转的RGB三色轮进行分光，让投射光源产生规则的红、绿、蓝光并投射到DMD上。此时，动态随机内存中的输视频信号还会 ...
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有关电视机爱问知识人- [ Translate this page ]按光源投射方式区分，有前投式和背投式两种。前投式的图像光束由观众后面投向观众前方的 ... 按投射光源的种类区分，背投式又可分为CRT（显像管）式，LCD（液晶）式 ...

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PDF] SU Media X: High-speed 3D shape digitization using projected light ...File Format: PDF/Adobe Acrobat - View as HTML
projected light patterns. We could develop a 3D shape recognition. system that operates at 60 Hz, the speed. of progressive video, thereby enabling the ...
mediax.stanford.edu/documents/high_speed_3D.pdf - Similar pages

Upcoming.org: Projected Light & Colour: Early Visual Music Colour ...Projected Light & Colour: Early Visual Music Colour Organs & Light Shows - llustrated talk by Cindy Keefer. When. Sunday, March 18, 2007 ...
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Amazon.com: Matte Black Projected Light with Pattern: Kitchen ...Amazon.com: Matte Black Projected Light with Pattern: Kitchen & Housewares.
www.amazon.com/Matte-Black-Projected-Light-Pattern/dp/B000A... - 86k - Cached - Similar pages