Lighting Products and Fixtures Design The Fellas Bulb by Hangzhou Hangke Optoelectronics Co.,Ltd. The Fellas is a ceiling light which adopts suspended linear light source. It is designed with anti blue light flexible light source which simulates the uniform and gentle 360 degrees lighting effect of natural light, and supports color temperature adjustment in a dual mode, i.e. AI and manual. Meanwhile, its shape is full of aesthetic feeling and sense of touch, which is integrated into the public space in a harmonious way and increases the artistic quality of the space.