Home › Forums › Sign Making Discussions › General Sign Topics › lightbox opal, which size and light % General Sign Topics lightbox opal, which size and light % Posted by Martyn on 26 March 2018 at 09:11 Hi guys, what do you use for everyday lightbox work, 3 or 4mm and what light percentage 30 or 50% thanks. Martyn replied 7 years, 9 months ago 1 Member · 1 Reply 1 Reply Martyn Member 27 March 2018 at 07:42 ok thanks, 4mm 50% it is then. i will try and come up with some more interesting questions in the future 😆 :thumbsup: Log In to Reply Log in to reply. Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me Log In to Reply Start of Discussion 0 of 0 replies June 2018 Now