I've had contact from a YouTuber asking about the Vectrex screen in my VecCab and it not looking like a Vectrex screen. It looks different to a normal Vectrex screen because I am using Ultraviolet (UV) light to light up a UV-painted overlay placed in front of the Vectrex display. Not my idea but one I fell in love with when Laurence Bennion of Blacklighter.co.uk came up with UV printed overlays and James Watt of ClockWorkrobot.com started supplying UV flames. The frame gives a bright uniform light around the screen and allows the UV to be used in daylight. You have to see it to believe it but it really adds value to the game graphics. Depending on the brightness of the UV (I can set this by adjusting the power fed into the frame) imagery on the overlay can appear either on front of or behind the Vectors - the effect is almost holographic. In addition, the overlays are multi coloured also contributing to the appearance of multi-coloured Vectors on the Vectrex.
My favourite UV overlay is the "Moon" one as this one goes well with a lot of the Vectrex space-themed games.