whats the deal with Hoffman?

[llcvt15]

I always figured my Hoffman set had a green picture tube beings it sat outside for at least three years (funny story...). I guess thats not the case as in the last week or so I've noticed several other threads about these sets and they all had green "easy vision" tubes in them. Were they the only company to produce sets like this? I almost have to wonder if watching an easy vision set would be somewhat similar to using a 1980's style computer console? Or then again it might just be like any other black and white set. Either way, just curious...