The cartel lowered operational costs and worked to standardize the life expectancy of light bulbs at 1,000 hours (down from 2,500 hours), while raising prices without fear of competition.

.....

representatives of lightbulb manufacturers "had told us that in evidence that they regard the 1,000 hours as the best possible compromise at the present time, nor has any evidence been offered to us to the contrary" with the commission stating that they "must dismiss as misconceived" the allegation of planned obsolescence.

Clearly they wouldn't lie to us!