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After so many years your bulbs will still use up the same watt. Saying "Watt Rate" is redundant because watt is a rate, 1 W=1 Joule / second. AFter 2.5 yrs of normal rate your bulbs are still consuming that same amount of power (Watt) but the lumens/watt and the color will have shifted. After 2+ yrs of use your T8 bulbs has probably lost 60-70% of the lumen output.
 
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