problem with headlight, please advise

so i got out and see a major difference between my right side and left side... it just happens out of no where.... so i turn the light off, and waited.... turn the lights on, normal at first, than lleft headlight quickly turns purple again.... do anyone know what cause this awkward color change out of a sudden??? please advise...
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Was it $30 for the bulb and $160 for labor?
