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Remains to be seen if they provide the correct spectrum for my seed starting grow lights. Just started my trays. Comparing them with my T5 florescent tubes which work great for seed starting but use a little more energy than I would prefer and only last 9mos running 12hrs a day. These LEDs if they are like my porch light should last 5x as long.. ( its on 24/7 and still burning 5yrs.)