32x32mm: http://www.hlvled.com.k.90qh.com/images/up_images/HL-M1388BR.pdf
37.5×37.5mm (1.5×1.5in?)
37,5x 37.5 Red/green https://pdf1.alldatasheet.com/datasheet-pdf/view/574150/LIGHTKEY/LM15088ABRG.html
https://www.openimpulse.com/blog/wp-content/uploads/2017/02/led_light_1.png
60x60mm red only https://www.photoxpost.com/greenforcecells/fimage/5mmred1.jpg
https://www.photoxpost.com/greenforcecells/fimage/5mmredgreen1.jpg
ftp://imall.iteadstudio.com/IM120410004_Colorduino/Documents/DS_M54564FP.pdf https://www.marutsu.co.jp/contents/shop/marutsu/datasheet/m54532p.pdf
