So not only do you get more light from a LED replacement bulb, they use less wattage.
-LED Is a Directional Light Source
The LED replacement bulbs emits light at a 110 degree pattern vs the 360 degree pattern given off by T8 fluorescent bulbs. In this case, only 30% of the light given off by the t8 fluorescent is actually hitting the intended target. This means you are not using all available light because the fluorescent bulb is also lighting the fixture. That's why fluorescent fixtures are brighter with reflectors.
-LED Transfer Light vs. Heat
A LED fixture uses its energy to produce light. Most lighting sources including fluorescent use heat to generate light which is why traditional incandescent, metal halide and fluorescent are losing favor with property owners.
-LED Still Give Off Light at End-Of-Life
A fluorescent bulb at the end of its life is very simple to spot, because it is DEAD, nothing left. A T8 bulb is considered end-of-life at 60% of its light output, which equates to roughly 14,400 hours. LED replacement bulbs on the other hand, calculate the end of life at 70% which is approximately 50,000 hours. In order to keep up with LED, you will have to replace the T8 bulbs 3.5 times
-LED Does Not Give Off UV
LED replacement bulbs does not emit any light in the non-visible light spectrum (UV). UV/IR light causes colors to fade in fabrics, signage, while also being the leading cause for eye strain and eye fatigue. Fluorescent T8 bulbs emit UV/IR light.
-LED Makes Air Conditioning More Efficient
LED fixtures contribute little to none in regards to heat gain in a room or air conditioned space. The LED generate less heat. Less heat means that the Air Conditioning system does not have to work as hard. This is vitally important if you are doing a new build or upgrade as you may be able to utilize smaller A/C systems to heat the same area.
-LED Provides 70% More Light
The beam angle of the LED replacement bulb is 110 degrees. This means that all of the light generated by the LED bulb is focused in the 110 degree area. The T8 bulb on the other has a beam angle of 360 degrees. That means the majority of the light generated by the T8 bulb is going out the sides and top of bulb, which does not benefit the intended target.