I replaced my work's office & warehouse with damar 5k bulbs from local light bulb depot chain store 2 years ago this month. If I remember right, they'll replace bulbs if entire unit fails within 5 year warranty & the quality & ratings were a little more trustworthy. Cheaper than internet listed prices with easy to setup cash commercial account.
Average fluorescents & 4k led bulbs look yellow & dingy in comparison to the 5k. The 5k damar I have at work & the 4'assembled 5k units from Sam's club at home both make area look like a bright white laboratory at night with enough of em. The damar's have a frosted tube which gives more of a uniform look compared to the others which you physically see the individual led's. At home the individual led's do reflect on my truck's black paint job, not really a shop issue otherwise as would be for a paintbooth.
not sure about the quality of the bulbs you're looking at . More lumens (output) = more $ ,4800lm on an 8' bulb ain't great. Ratings can be deceiving, particularly with lower quality stuff & led's also fade with age , as do flourescents. Personally I'd do 5k over 4 for anything but an area wanting soft light such as kitchen. Would quickly consider 6 over 5, though haven't owned any yet.
One time wiring for bypass bulbs is a minor pain, but result AND costwise with aging ballasts, I'd call it stupid NOT to switch over these days if you're able to rewire. Most 4' bulbs require a hot & ground on same end (bulb one side powered) & 8'single pin hot to one end & ground to other (either direction if I remember right). Not having ballast heat in summer, slow buzzing start in winter, & 40 something percent average energy savings is priceless.