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BEWARE of cheap home-made "decals" or stickers offered for sale on social media and elsewhere which are often made on home desktop printers suffering from fuzzy print. They are frequently made on thick vinyl which leave a very obvious lip on your model, or on a giant sticker which then have to be cut out very carefully to get the correct size with straight edges that look right (which isn't easy). Railtec product is wafer thin waterslide transfers with crisp print, ready-made to size, and manufactured on hugely expensive technology which blend seamlessly with the model to give a professional result. Intended for application to inside of lighting unit. Cut/apply required digits and allow to set. Cut/apply required amount of black backing and place over the digits. When viewed normally the digits are visible and the LED will also shine through, illuminating the digits.
This sheet is spot printed so just contains a small amount of carrier film where it needs to be in order to aid with application, leaving a seamless finish.