The light fixtures currently installed meet the specified criteria however what do you do if the bulbs were replaced not too long ago and their lifetime will outlast a 2 year window. The plant has approzimately 4,000 T5 bulbs and a good lifetime for them is about three years. Some of the other bulbs will need to be replaced but they are T12, T8 (normal and U -shaped, and a few other odd bulbs. Most of the bulbs being replaced will be T12 bulbs which have a mercury content of 109pg/lumen hour so 90% of bulbs purchased wouldn't be under 90pg/lumen hour. The plant has a total of just over 6,000 lamps (so looking at possibly up to 2,000 lamp replacements during performance period). Is there anyway to work around this or would we potentially have to replace T5 lamps about 6 months earlier than necessary to achieve this credit?