Ah, LEDs OK. I'm going to re-organise my workroom once I can see the floor again, I think new lighting might be on the cards.
I'm getting fed up with the sun streaming in through the windows in the late afternoon, and into my face, so I can't see anything ( of any colour) when I'm using the overlockers unless I lower the blinds and that's no fun when the sun is shining! ( never satisfied, me!)