Random and Unsorted Bits

Plugtest - Making and Selling Lamps
BlinkStick - easy way of controlling LEDs through an interface to a PC, Raspberry Pi, ...
Building DIY LED Lights - intro to LED lights, and how to use them in your electronic projects
Testing Fire Retardant Spray - for lampshades and other flammable materials

Poor Quality and Damaged Components

Crabtree Lighting Pendant with cheap-o-matic lampholder terminals
Defective 13A BS1363 Moulded Mains Plug Taken Apart
Faulty flex
Failed SELV Transformer