question: What is the IEC guideline for an unacceptable level of light loss ?
answer: An incandescent lamp that gives 93 % or less of its initial light output at 75 % of its rated life is regarded as unsatisfactory
turker_answer: An incandescent lamp that gives 93 % or less of its initial light output at 75 % of its rated life is regarded as unsatisfactory by the IEC guideline for an unacceptable level of light loss .
rule-based: The IEC guideline for an unacceptable level of light loss is an incandescent lamp that gives 93 % or less of its initial light output at 75 % of its rated life is regarded as unsatisfactory .