When it comes to the size of the tube diameter, straight tube fluorescent lights are categorized based on their width, such as T12, T10, T8, T6, T5, T4, and T3. The "T + number" in the specifications represents the millimeter value of the diameter. Specifically, one T equals 1/8 of an inch, and one inch is 25.4mm. So, for instance, T12 equals 25.4mm * 1/8 * 12, which is 38mm. There's also a connection between the diameter of the fluorescent tube and its electrical parameters: Firstly, the thinner the tube, the higher the light efficiency, leading to better energy savings. However, thinner tubes require a higher ignition voltage, which increases the technical demands on the ballast. Fluorescent tubes with diameters larger than T8 (inclusive of T8) have a lower ignition voltage. This matches the rule that the ignition voltage is less than half of the power supply voltage when compared to 220V, 50Hz AC. Therefore, an inductive ballast can be used for ignition. On the other hand, tubes with diameters smaller than T8 have a higher ignition voltage, which doesn't align with the aforementioned rule. Thus, these tubes need to be paired with electronic ballasts, which generate the necessary high voltage for ignition and then maintain the fluorescent tube's operation. In terms of color, straight tube fluorescent lights come in three main types: those with three primary colors, cool white daylight, and warm white daylight. The color of fluorescent tubes depends on the phosphors applied and the type of gas inside. This significantly affects both the light color and the technical quality of the tube: First, some fluorescent tubes are coated with halogen phosphors and filled with argon or helium-argon mixtures. Their colors include cool white daylight and warm white daylight. These tubes have poor color rendering performance, with a color rendering index (R value) below 40, far from the standard R=100 of natural sunlight. This results in a color shift when viewing objects, making them appear dull, grayish-green, or lacking vibrancy. These tubes also have lower luminous efficiency, typically around 30 to 40 lumens per watt. They emit more invisible light in the spectrum, which reduces effective pupil dilation and overall visibility. Moreover, their ignition life is relatively short, usually between 5,000 and 6,000 hours. These tubes aren’t considered energy-efficient or environmentally friendly lighting solutions. Secondly, some fluorescent tubes are coated with tricolor rare earth phosphors and filled with highly efficient luminescent gases. These tubes produce a high-color-rendering, sun-like color through a combination of three primary colors. Their color rendering index (R value) exceeds 80 and closely mimics natural sunlight (R=100). These tricolor rare earth fluorescent tubes boast a relatively high luminous efficiency, averaging around 65 lumens per watt. The actual luminous efficiency depends on the technical features of the ballast used and how well it matches the fluorescent tube. Some online resources claim that the luminous efficiency of straight tube fluorescent lights can exceed 100 lumens. Tricolor rare earth phosphors (also used in LVD electrodeless lamps) ensure a longer ignition life, typically over 8,000 hours. Advanced electronic ballasts can extend this life to between 15,000 and 20,000 hours. Swing Fountain,Graphic Waterfall Fountain,Water Features,Outdoor Garden Fountain Guangzhou Dewy water fountain Technology Co., LTD , https://www.dewyfountain.com