Mercury-free lamps (such as LEDs) do not need to be included in purchasing plan, and can only be included if they are more efficient than their mercury-containing counterparts If you would like to include mercury-free lamps in the purchasing plan, you must provide documentation confirming that those lamps are in fact more efficient than their mercury-containing counterparts. Therefore, if you are unable to obtain that documentation, it is best to not include mercury-free lamps in the purchasing plan. If you include mercury-free lamps in the purchasing plan, you must also include those mercury-free lamps listed in the purchasing plan that were purchased during the performance period in Table MRc4-2.