This read-only value is the highest optical output power reading recorded for this lane's low-power statistics group during the current statistics interval, expressed using Coriant's optical-power measurement type. An admin watches it to catch times when transmit power on that lane spiked toward an upper threshold that could signal a faulty transceiver setting. For example, on a Groove transponder, an outOpticalPowerLaneLowMax reading well above the lane's usual average would lead an operator to check whether the laser bias drifted before scheduling a module inspection.