Analysis of energy-saving lamps due to the different shape of the tube, mainly U-tube, spiral tube, straight tube type also lotus type, plum type, bergamot type and other opposite sex:
2, spiral tube energy-saving lamps: spiral tube diameter.
The number of spiral loops (indicated by T) is: 2T, 2.5T, 3T, 3.5T, 4T, 4.5T, 5T, etc., and the power is from 3W-240W and other specifications.
3, bracket energy-saving lamps: T4, T5 straight tube type energy-saving lamps: T5, T4 straight tube type energy-saving lamps. Power is divided into: 8W, 14w, 21W, 28W. Widely used in civil, industrial, commercial environment lighting. Can be used to directly replace the T8 straight tube type fluorescent lamp. 
T, which represents the diameter of the tube. Each "T" is 1/8 inch.
One inch is equal to 25.4 mm. Then the diameter of the T8 tube is 25.4mm.
Three primary color energy saving lamp pictures
In theory, the finer the lamp, the higher the efficiency, that is, the more wattage of the same wattage. However, the thinner the lamp is, the more difficult it is to start, so when it comes to the T5 lamp, it must be started with an electronic ballast.
In order to save costs, T5 and T4 are sold in the form of micro-brackets, which are contained in the micro-space of the bracket. The efficiency and quality of such ballasts are generally not good, resulting in lamps that should be highly efficient. Contrary to the conventional T8 tube, the life is also a bit discounted. Despite this, the temptation of the thin tube is still very large, and the sales of T5 and T4 tubes are getting bigger and bigger.
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