Reference Guide correction ID# 100002036 (released 10/1/2015) removes the requirement to purchase lamps during the performance period. Based on the correction language, it appears that teams can simply confirm that no lamps were needed. However, it is unclear whether teams should also confirm that existing installed lamps meet the credit threshold when pursuing this option. You may want to provide a lamp inventory (e.g., the “lamp purchasing plan” from EBOM 2009) to demonstrate that the overall building average is 70 picograms of mercury per lumen-hour or less.