I have spent the last several weeks on a scaffold pulling ballasts and rewiring 4 foot four bulb troffers at my church. Some ballasts are really hot when removed, some actually dripping black gooey stuff. Going from 120 watts to 50 watts per fixture. Never have to worry about a ballast going bad again. So far I have replaced 176 bulbs. I do 8 fixtures per day, my neck can't take much more than that. Using these, about $7.00 per bulb delivered. https://www.1000bulbs.com/product/192824/PLT-10848.html So far, 100% work out of the box. Interested to see how the Utilitech's work out for you. But we may not know for ten years...
We hope to get a $2.25 per bulb rebate from DTE. Consumers, the other supplier in the area, offers $5.00 per bulb.