I suspended the handle of this light from a cardboard tube above my Plumerias a month ago in my garage. The combination of the warmer temperatures and this light brought the Plumeria out of hybernation.
The light was plugged in the whole time, and stayed pretty bright, but the battery drained all the way while plugged in. The light never overheated or had any issues other than the battery drain.
This worked for about a month and I finally put the plants outside when the weather warmed up.
This light also comes with a usb plug so if you want to run a usb fan for ventilation or some other usb device, you won't need a usb power supply.