Light + is a magical lighting tool.
Its like having your own little rainbow on your device, ideal way of controllable light for photography.
This app is fantastic for providing quick incidental lighting or ambience to low light photography. Just used it very successfully on a long exposure shoot. Can't fault it.
If you want to change the color or brightness just touch the screen and drag your finger to wherever color you want. For more functions, please double tap screen to settings page.