Replacement lens for this unit is not available.
Please review spec sheets from Acuity under-cabinet mix: https://www.acuitybrands.com/search#q=undercabinet&t=ablAll&sort=relevancy&f:@productbrandname=[Juno,Lithonia%20Lighting]&f:@lightingproducttype=[Undercabinet]&f:@lightsource=[LED%20-%20Static]
part# UC 5FT POWERCORD WH- White 5' cord and plug Available via special order. https://img.acuitybrands.com/public-assets/catalog/834585/contractor-select-ucel.pdf?abl_version=10%2f08%2f2019+22:09:53&DOC_Type=SPEC_SHEET
This fixture can be direct wired. Cords you can order as separate catalog number. Please review attached spec sheet. https://images.homedepot-static.com/catalog/pdfImages/21/214d6fbc-587d-449f-a675-3e48794fb487.pdf
That's the way I operate mine. ;) There is a switch on each fixture, however, so you can turn off as many as you want if you don't need them all at the same time. That includes turning off any fixture in a chain, the individual switch controls only that fixture, none of the others in the chain.
Can direct-wire through rear access plate/knockout by utilizing the included Romex connector or by utilizing the optional UCD JB Junction/Splice box (sold separately) https://www.acuitybrands.com/products/detail/834585/Lithonia-Lighting/Contractor-Select-UCEL-LED-Undercabinet/-/media/products/Lithonia_Lighting/834585/document/Contractor-Select-UCEL_pdf.pdf?DOC_Type=SPEC_SHEET
Yes, this fixture does have a center knockout for installation use.
I had to use the online Home Depot help line to find the correct cord, it's a pain but worth it, this is a really nice light.
Yes they are available in 4000K, model number UCEL 48IN 40K 90CRI SWR WH M6