Florescents: T9 in both 9" and 16"
Have used T9 in both 12" and 16". Life expectancy was rated for 4yrs. Not so : 9" has lasted 3x as long as 16".
i.e. have had to replace 16' every 5-6 months, which on average of 5hrs/day use = 840 hrs. vs 1 yr. or 1820 hrs. {anticipated}. Certainly not the 4 years printed on each box...which would be 7280 hrs.
T9's are used together in a small kitchen area. And yes, ballast was checked.
