Detailed product description: Self-ballasted energy-saving tube lights t5 in t8, good color rendering index Retrofit: t8, t9, t10 or t12 Energy-saving up to 60% 20, 000 hours lifespan Warranty: 2 years With transparent pc or glass shell To help your client save 60% fluorescent lighting bill with no electrical work Features: Easy-to-install and replace old t8 and t12 with no electrical work Patented built-in mirror reflector, make more use ratio of the lights High frequency operated electronically ballast (30000 to 50000hz), no flicker, glare free, eye-protected, great for schools and workshop Super energy-saving: 45% to 65% energy-saving than normal t8 fluorescent tube, 25% energy-saving than normal t5 with same lumen output Comes with 5 national patents Rapid payback in 6 to 8 months, much lower than leds (led need 3 years to 5 years to get payback) Ccc/ce/rohs/emc-approved, great color rendering index >82, light efficiency up to 132lm/w, tricolor phosphor make more real colors Aging-resistant, burning-resistant, liquid/mercury-free Comes with 10, 000 hours or 2 years guarantee, reduces maintenance by 66% due to 20, 000 hours extended lifespan Standard 2ft, 3ft, 4ft, 5ft long are available Customized sizes are accepted