Interchangeable decorative tube device for fluorescent lighting

An illuminated sign lighting apparatus for generating an illuminated image, said illuminated sign lighting apparatus comprising:

• a fluorescent light tube to provide a light source for generating light through said image;
• a fluorescent light fixture having a substantially elongated base portion substantially the same length as the fluorescent light tube, two electrical connection portions each connectable to respective ends of said fluorescent light tube, and a power supply for supplying electrical power through the two electrical connection portions to the fluorescent light tube;
• a first color sleeve surrounding the fluorescent light tube for coloring the light transmitted through said image, said first color sleeve having a diameter substantially the same as the diameter of the fluorescent light tube so as to be slidably fittable over said fluorescent light tube so as to be supported by said fluorescent tube;
• and
• a second substantially opaque sleeve surrounding the first color sleeve, having decorative light transmissive portions forming said image as light-transmissive openings along a portion of the first color sleeve and applied opaque printed sections for blocking light-transmission around said image, said second substantially opague sleeve having a diameter substantially the same as the first color sleeve so as to be slidably fittable over said first color sleeve so as to be supported by said fluorescent tube.