I've really enjoyed working with the TorchLED Bolt. Highly recommend you invest in one or two of these. I've used mine for a background light, rim/hair light, catchlight and in some cases a fill light. Such a great little light to have in your bag for any project.
More info here: dslrvideoshooter.com/episode-53-switronix-torchled-bolt-light-panel-review/
You can find the light here: bhphotovideo.com/c/product/824710-REG/Switronix_TL_BT200_TorchLED_Bolt_On_Camera_LED.html/BI/6566/KBID/7173