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Reflection: In this project, we want to test which pencil lead that can make the LED light brightness. We decided to make it to be cactus to make it's more attractive. We use light sensor to measure the brightness of each pencil lead because it's more accurate than use our eye and get exactly the result. By doing this project, I learn how to connect the electricity circuit, and also learn how to work as group and help each other to solve the problems.