When high-pressure sodium lamps are used for a long time, their power consumption will increase. This is because the evaporation of the filament and the chemical reaction inside the lamp tube will cause the resistance of the lamp to become larger. Then the power consumption will increase. بجانب, the brightness of the lamp will dim. The lamp tube and filament need to be replaced regularly.
المزيد من القراءة: عمر أضواء الشوارع LED: كم من الوقت يستمرون?



