Indoor LED fluorescent tube case analysis

Offices include general offices, office buildings, business centers, etc. Due to the particularity of office spaces, office workers are required to keep their minds fresh, comfortable and peaceful for a long time, and work efficiently without feeling tired. Offices are generally used most frequently during the day. The lighting of office spaces is usually based on the needs of office functions. While making full use of natural light, it is combined with artificial lighting to maintain a stable, reasonable, comfortable and healthy light environment. The purpose of lighting is to create a good working environment that meets the illumination requirements and has uniform illumination; reduce the stroboscopic effect and glare of lamps to reduce the visual fatigue of office workers. Therefore, a cooler light color should be used, and the color temperature is usually between 4200 and 5300K, which is closer to the morning lighting, so as to keep a calm and clear mind. Bare tubes can be installed on the ceiling, or metal reflective fluorescent lamps can be used for hanging. In office buildings, aluminum alloy reflective grille fluorescent lamps are often used for embedded ceiling installation.

Office lighting requirements

1. Choose the appropriate light source color temperature and color rendering index . In office spaces, generally choose a color temperature of >4000K and a color rendering index of Ra≥75.
2. Lighting level: Different environments and different places have different requirements for lighting. The illumination of office spaces should meet the use requirements, generally 500-1000lx.
3. Lighting uniformity: Arrange lamps reasonably to make the illumination uniform, so that the difference between the maximum and minimum illumination in the office and the average illumination is less than 1/3 of the average illumination.
4. Comfort and glare control: When there is too high brightness or too large brightness ratio in the field of vision, people will feel dazzling glare. The measures to prevent glare are mainly to limit the brightness of the light source and arrange the light source reasonably. For example, make the light source above 45 degrees of sight, form a shading angle or use opaque materials to block the light source.
5. Safety: Mainly consider the safety of the lamp structure, the safety of electrical appliances, whether the lamp meets national standards, whether it has passed 3C certification, etc.
6. Energy saving and environmental protection: choose high light efficiency light source, high efficiency, long life, reasonable light distribution lamps, high performance, long life accessories, etc. Light distribution generally chooses bat wing light distribution, so that the light intensity can be uniform and widely distributed.

Introduction to traditional fluorescent lamps

Fluorescent lamps are also called fluorescent lamps. Structure and function of fluorescent lamps: There is a filament at each end of the fluorescent lamp, and the lamp tube is filled with a trace of argon and thin mercury vapor. The inner wall of the lamp tube is coated with fluorescent powder. The gas between the two filaments emits ultraviolet rays when conducting electricity, making the fluorescent powder emit soft visible light. Working characteristics of fluorescent lamps: A high voltage is required when the lamp tube starts to ignite. Some special gases are filled in the lamp tube, and fluorescent powder is coated on the tube wall of the lamp tube. After power is turned on, light is generated due to discharge. Filaments are installed at both ends of the fluorescent lamp tube, and the inner wall is coated with a uniform thin layer of fluorescent powder. The tube is evacuated into a vacuum, filled with a small amount of inert gas, and a trace amount of liquid mercury is injected at the same time.

Inductor When the current in the coil changes, the magnetic flux in the coil will change, thus generating an induced electromotive force, the direction of which is opposite to the direction of the current, thus hindering the current change.

LED fluorescent lamp Tube Introduction

LED fluorescent lamp tubes are the same as traditional fluorescent lamps in terms of appearance, size and diameter. There are four lengths of 600mm, 900mm, 1200mm and 1500mm. Their power is 9W, 14W, 18W and 25W respectively, while the actual power consumption of 20W traditional fluorescent lamps is about 53W, and the actual power consumption of 40W traditional fluorescent lamps is about 68W; the brightness of 9W LED fluorescent lamps is brighter than that of 18W fluorescent lamps, and the brightness of 18W LED fluorescent lamps is brighter than that of traditional 40W fluorescent lamps. The brightness of LED fluorescent lamps is especially softer and easier for people to accept. The service life is 30,000-50,000 hours. The power supply voltage is AC85V-260V (AC). No starter and ballast are required. It starts quickly, has low power, no flicker, and is not easy to cause visual fatigue. It is not only super energy-saving but also more environmentally friendly. It is currently the main product to replace traditional fluorescent lamps.

LED lamps Advantages in office lighting

1. Environmentally friendly lamps, protect the earth
Traditional fluorescent lamps contain a lot of mercury vapor. If the mercury vapor is broken, it will evaporate into the atmosphere. But LED fluorescent lamps do not use mercury and LED products do not contain lead, which protects the environment.
2. Efficient light emission, reduce losses
Traditional lamps emit light in 360 degrees, while LED lamps emit light in a directional manner and will not cause light loss.
3. Quiet and comfortable, no noise
LED lamps do not produce noise, which is the best choice for occasions using precision electronic instruments. Suitable for occasions such as libraries and offices.
4. Soft light, protect eyes
Traditional fluorescent lamps use alternating current, so they will produce 100-120 strobes per second. LED lamps convert alternating current directly into direct current, which will not produce flickering and protect eyes.
5. No ultraviolet rays, no mosquitoes
LED lamps do not produce ultraviolet rays, so there will not be many mosquitoes around the light source like traditional lamps
. The room will become cleaner, hygienic and tidy.
6. Adjustable voltage 80V-265V
Traditional fluorescent lamps are lit by the high voltage released by the rectifier. When the voltage is reduced, they cannot
be lit. LED lamps can be lit within a certain range of voltage, and the brightness can be adjusted.
7. Save energy and have a longer life.
The power consumption of LED fluorescent lamps is half of that of traditional fluorescent lamps, and the life span is 10
times that of traditional fluorescent lamps. They can be used for a long time without replacement, reducing labor costs. More suitable for occasions that are difficult to replace.
8. Sturdy and reliable, long-term use.
The LED lamp body itself uses epoxy resin instead of traditional glass, which is more solid and reliable. Even if it is smashed
on the floor, the LED will not be easily damaged and can be used with confidence.

Evaluating the LED lamp transformation in office places

Aluminum extrusion has several cross-sectional shapes, which vary according to the substrate used. Some have a cross section in the middle (Figure 1), some are hollow in the middle (Figure 2), and some use two layers (Figure 3). The heat dissipation form behind is also different. Some use small corrugations (Figure 1), some are fins (Figure 2), and some have no heat sink (Figure 3). The thickness of the heat sink is also different. Choose the application according to the actual situation. Figure 1 is not coated with grease, and Figure 2 has grease coated on the aluminum extrusion to increase the heat dissipation effect (as shown above)

Figure 1 Figure 2 Figure 3

PC covers have several cross-sectional shapes, some are less than a semicircle (Figure 1), some are semicircles (Figure 2), and some are perfect circles (Figure 3). The aluminum extrusions that match them will also correspond to them (except Figure 3).

Figures 1 and 2 are not full circles, so there will be aluminum extrusions at the back to match them. This structure is suitable for using SMD chips, and the aluminum extrusions added at the back can effectively dissipate the heat generated by the LED in a timely manner. Figure 3 is a full circle, and this structure does not use aluminum extrusions, so this structure is suitable for plug-in lamp beads.

Figure 1Figure 2Figure 3

The surface of the PC cover will also vary depending on the required uniformity of light. Some are fully transparent (Figure 1), which has the advantage of allowing all the light to irradiate the outside of the lamp tube. Some are striped (Figure 2), which can disperse the light and obtain more uniform light, but there will be a certain amount of light loss (about 10%). Others are milky white (Figure 3), which can achieve a uniform light output effect, which is the same as the effect of traditional fluorescent lamps, but this solution will lose 30% of the light. You can choose different PC lamp covers according to different usage occasions to achieve the corresponding effect. (As shown in the figure above)

Different color temperatures of LEDs will produce different visual effects. 3000K-4500K (Figure 1) will produce a warm feeling, but the relative illumination of this color temperature is low. 4500K-6500K (Figure 2) is what we call white light, which looks white. 6500-8000K (Figure 3) is cold white light, which looks cold, and the relative illumination of this color temperature is high. Different color temperatures can be selected according to different usage occasions to achieve different effects. (As shown in the figure above)

From the table above, we can see that the relevant results of the LED lamps of the four companies we randomly selected above have some parameters that will be different. The number of LED light sources selected ranges from 144 to 168, and the luminous flux also ranges from 650 to 940LM, with a difference of 290LM. The input voltage has a wide voltage and a narrow voltage. The color rendering index is basically around Ra=75. After the national LED lamp standard is issued, there will be a standard and specification. The above are the test results of each manufacturer (as shown in the figure above)