Did some experiments with it, and truth is, it is very dangerous. Also, with this kind of light concentration, you NEED serious eye protection, even the light reflecting off of your target and being scattered back to you, an inflict some real damage.
It was great fun for a while, even used it to cause "rocks" to explode. I got tired of it after a few days, put it away, where it eventually got scratched up and became useless, so I threw it out.
If I had to to it again, I would build a proper frame for it. Probably use it for something more advanced, maybe a small steam generator/engine.
Someone must have manufactured these as subcontractor to large screen tube TVs. Why can't they be still available somewhere?
It is the perfect tool for a cheap power solar still quickly to produce large quantities of safe drinking water.
Limited only by human imagination.
With an old hot wter heater tank and coil of copper, the solar heating via a lens would be a neat-o system.
You could probably power a decent Stirling engine with it.