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Low wattage T5 fluorescent lamps (4W to 13W) are usually used in appliances, medical or other specialty applications. Higher wattage T5 fluorescent lamps 14W to 54W) are used for ambient lighting and provide higher source brightness than T8 lamps, better optical control and equivalent or better efficacy (lumens/watt). These lamps are generally not suitable for retrofitting T12 or T8 systems because they have unique metric lengths, special lampholders and different ballast requirements. High output T5 bulbs deliver twice the lumens in the same length as T8.