"Looks awesome, I got the Lumed backing for my F-91W. It does take quite a bit of light to charge it, but if you are outside and go indoors it shines pretty bright. As for the regular backlight, MASSIVE improvement! Looks great! Instructions were clear and despite never opening a watch before, I was able to knock it out in about 20 minutes using the video guide."
Back Light Spreader for Casio F-91W, A-158, A-159, A-171, W-59, F-94W, Sensor, Ollee, and more. Drop-in, No Soldering Modification / Upgrade