With another week to go on the free shipping, the internet is still silent on the subject of LED strips bursting into flames, but lions know a dead short with a 250W power supply can ignite something.  Depending on how they're daisychained, the 2 strips can require 24V or 12V, so the plan was to use an ancient computer supply + a PWM generator that delivered constant current with a software fuse.  

Since these lights are put up by 10 year olds & everyone uses constant voltage, the vision constantly got downgraded until it was just a MOSFET with a 10A automotive fuse soldered in line.  Of course, it would be more efficient to PWM the MOSFET than operate it in pinchoff mode, so threw in a microcontroller, making it the world's most expensive copy of a free Chinese PWM generator.