13.9 yuan package purchased a Philips 3W bulb. Philips lights, the price is high. Buy a test and feel it. Look at the difference between big brand products? Here are the parameters, 3W 200LM color rendering index 80 light effect 70LM/W Not iron The tail is different from a normal bulb, like an old-fashioned incandescent lamp. There is also a solder joint here. . . . Old rules, the goal goes again. The manufacturer's standard parameters are all in line. 200LM, color rendering index 81.3, light efficiency 79.5LM/W. The light transmittance of the cover is 94.8%, which is relatively high. Here, the light transmittance is only a rough idea, because the cover will be removed, the temperature rise of the lamp bead will be lower, and the luminous flux will increase. Remove the cover. Insert the knife and lick it again. . . . It is all around. . . Cover shape Power on, measure the drive output voltage. Around 18V, 3 lights. Description is a high-voltage lamp bead, a single 6V or so. . . . Output current Look at the lamp bead chip, the two chips inside are connected in series! It is essential to measure the temperature rise of the lamp beads. Room temperature stable temperature Stable temperature after 2H. The temperature rise is 50.3 degrees. Not too low. . . . Continue to disassemble. . . The screws that fix the light board are very long. The knife cuts off the glue around it. This glue is used to fix the aluminum radiator and cover of the lamp. When the glue is removed, the aluminum heat sink is released. Shaped like a bagel Come and come, measure the measurements. . . . Thickness is not too thick There is also a print on the back of the substrate. . . . Different! The glue is glued inside. . . . The outer casing is not ceramic, the soldering iron can be hot! Drive the no-load output voltage. . . . Slightly fluctuating After the disassembly, return it. Thermally conductive silicone is placed around the side of the aluminum heat sink. It is hoped that the aluminum foil heat sink and the outer casing can be connected by thermal silica gel to transfer heat! The back of the light board is also made of thermal silica gel. Installed. Use a layer of thermal silica gel around to facilitate the sticking of the cover. When the thermal silica gel is cured, it is O. 1. Philips 3W bulbs, high prices. 4.6 yuan / W. 2. The photoelectric parameters are in accordance with the manufacturer's specifications. Nominal 3W, stable power 2.5W. The color rendering index and light efficiency are both higher than the nominal, which is not bad! 3. The light board is locked with screws, which is very appreciated by the individual. 4. The lamp is heavier than the general one, which is the driving glue to increase the weight! Of course, the glue is also cost, and it can be made moisture-proof. . . . Heat transfer to the E27 metal base. 5. The details (work) are good. Single Burner Electric Hotplate Portable Hot Plate,Single Burner Electric Hotplate,Hot Plates,Hot Plates With Stainless Housing Shaoxing Haoda Electrical Appliance Co.,Ltd , https://www.hotplates.nl