The development of LED fluorescent tubes

Around 2005, the early LED lamp tube housing was fully plasticized, the lamp bead was made of F5 straw hat LED lamp bead , the circuit board was made of glass brazing plate, the power supply was built-in non-isolated power supply, and the whole lighting effect was about 40-60LM/W. However, it was quickly discovered that the light decay of this kind of fluorescent lamp is very serious, and the life span is actually only 1000-2000 hours. This is mainly caused by the straw hat lamp packaging structure and the material of the lamp tube. Because the heat dissipation of the straw hat lamp mainly depends on two legs. In addition, the lamp circuit board is a glass soldering plate, and the outer casing is all plastic, so the overall heat dissipation performance is very poor, and the heat generated by the whole lamp is sealed in the tube, and cannot be dissipated at all, which leads to the whole The lamp will be scrapped in a short time, which also makes consumers lose confidence in the LED tube.

The second generation of LED fluorescent lamps (3528, 3020)

Around 2007, most manufacturers began to use the patch light source to make fluorescent lamps. The outer casing also began to use semi-aluminum and semi-plastic. The circuit board began to use aluminum substrates , but this is a rather chaotic period. The light sources used are 3528, 3020, 5050, etc. There are even 1W high-power LEDs , and because the schemes adopted by each family are different, the whole lighting effect is around 60-80LM/W, and the power supply has built-in, external, isolated, non-isolated multiple schemes. At this time, the buyer Become confused, the prices of various products vary greatly, I do not know how to choose.

Third generation LED fluorescent lamp (3014 low current medium current)

Around 2009, due to the rapid development of LED, the light effect of LED lamp bead is also rapidly improved. High luminous efficiency (100LM/W), good heat dissipation and small size 3014 SMD LEDs are designed in fluorescent lamps, and the overall lighting efficiency is also improved. 70-80LM/W, this stage has a good effect, the price has dropped a lot, and sales have started to rise. At this stage, the mainstream products in the market are mainly 3528, 3014, but there are still many gaps between the price and the goal of the people.

The fourth generation of LED fluorescent lamps (3014 high current and high lumens)

Around 2011, the use of 3014 patch to make fluorescent lamps, due to the increase of the luminous flux of a single LED current, high luminous efficiency (110LM / W), in the case of the same light bright, the use of LED lamp beads The quantity is also reduced, the cost is also reduced, and more importantly, the 3014 chip has better heat dissipation performance, larger light-emitting area, and better light-emitting rate. It can be concluded that the 3014 SMD LED becomes the core of the lamp for a long period of time. The light source is bound to be a trend.

The fifth generation of LED fluorescent lamps (2835 high current and high lumen)

Around 2013, the 2835 patch was used as a fluorescent lamp. Due to the increased luminous flux of a single LED lamp bead, the high luminous efficiency (120LM/W), in the case of the same luminous flux, the LED lamp bead The number is also reduced, the cost is also reduced, and more importantly, the 2835 chip has better heat dissipation performance, larger light-emitting area, better light output rate, etc. It can be concluded that the 2835 patch becomes the lamp core in a relatively long period of time. The light source is bound to be a new trend.