Will LED light work if polarity is reversed?

Will LED light work if polarity is reversed, generally no, LED light will not work if polarity is reversed because LED is light emitting diode which is diode that allows current to flow in only one direction, requiring correct polarity with anode positive and cathode negative to light up, with reversed polarity blocking current so LED will not illuminate. If you reverse polarity of LED, it will not light, but most small LEDs will not be damaged immediately if voltage is low, as diode blocks reverse current, so LED simply stays off, with no light, until polarity corrected. However, if reverse voltage is high enough exceeding reverse breakdown voltage, typically around 5 volts for many LEDs, LED can be damaged permanently if reverse polarity applied with high voltage. For LED strips and LED bulbs with built in driver, many have reverse polarity protection and will not work if reversed but not damaged, and will work when corrected. Some LED fixtures with electronics may be damaged by reverse polarity. So will LED light work if polarity reversed, no, it will not light because diode blocks reverse current, with LED requiring correct positive to anode and negative to cathode, with reversed polarity resulting in no light, and potential damage if high reverse voltage applied, so always check polarity before powering LED.