GSL, page-24

Of course panel efficiencies are lower than laboratory cells - true for all technologies.

I didn't say First Solar CdTe were behind the pack, I said they were lower than "hero cell" monocrystalline Si. They're comparable with Si at the panel level, and have other advantages such as better performance in high temperatures and cloudy conditions.

Silicon panels have a range of efficiencies - the best (most expensive to make and buy) monocrystalline cells are currently just over 20%. Cheaper panels have lower efficiencies at a commensurate cheaper price. Polycrystalline panels for example.

https://news.energysage.com/what-are-the-most-efficient-solar-panels-on-the-market/

Domestic Si panels vary in power generation - mostly in the 250-300 watt range, some as high as 400 watts. 10 years ago the range would have been 200 - 250 watts. A significant increase, but nowhere near the gains that should be seen in Perovskite cells/panels over the next decade (Silicon cells have been under development for decades and are now approaching theoretical efficiency limits).