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this will help tremendously. 20-30% brighter. high kelvin temp bulbs 'appear' brighter and 90 CRI is nice if you find them...

lenses cut 15-20% of the light output of a fixture. plus they collect "critters". Lightolier just cam out with an IC rated linear troffer. T5 lamps are about 4 times as expensive and only 50% longer life. plus they have to run hotter. light levels **** in the cold. T8 fixtures and larger...

lumen depreciation is a problem once lamps (light bulbs) reach their rated life. some lamps will continue to burn, but produce maybe 30% of their initial output. most large retailers relamp a store every 18 months to two years, 1 - because it's cheaper than have a guy run around changing lamps...