Nine products failed to meet the ±1

Nine products failed to meet the ±10% criterion for input power, all drawing less than 90% of the rated input power. In addition, eight products had a measured efficacy greater than 110% of the listed value, and three products had an efficacy less than 90% of the manufacturer’s rating. Notably, 23 of 38 products met all three claims for input power, efficacy, and lumen output, whereas four products did not meet any claims. The other 11 products failed to meet one or two of the claims for those parameters. In general, lower input power and higher efficacy are favorable, but the accuracy of reported data is also important for building consumer confidence. One interesting note is that claimed efficacy did not always match the quotient of rated lumen output and rated input power.