The same is 5V, but the output current is different. You can not only look at the voltage, but also the current!
For example, if the output of a 5V battery is 0.5A, then its output is 2.5W
The output of 5V solar power is 0 ,1A. The solar power is then 0.5 W.
The key is power, not voltage. The power of such a large solar panel is very low and cannot satisfy the power of a light bulb.
The solution is simple: just replace it with a light-emitting diode which consumes very little energy. 'energy. It is also much cheaper than a light bulb, only a few cents each.
Today, due to their high efficiency, low cost and long life, luminescent tubes have gradually replaced light bulbs in areas with low requirements. For example, ordinary flashlights, car taillights, brake lights,etc.
The 120V you mentioned between the computer case and ground is also induced static electricity. The voltage is high but the power is very low. It discharges as soon as it is turned on and cannot turn on the computer. bulb. If you have any questions, ask me. I will ask you this forever. I do not understand either.