... : RONT patented T8 fluorescent lamp tube in tube light Series: 1. Fluorescent tube light Power Type: 14w,21w,28w, 2. Fluorescent tube light length: 600mm,900mm,1200mm. 3. Fluorescent tube light base type ... filament bulb, super brightness. 2. Prove life span over 10,000 hours, 3 times of filament bulb. 3. Tube in tube structure reduces heat ...