Weird iOS Light Rendering

Does anyone know what causes this? I thought perhaps it was my rendering path (switched from Forward to Deferred). There are two Directional Lights in the scene. On all my iDevices it renders as I want (including in the Unity Editor). However, with my iPhone 6+, I get this weird rendering of the directional lights (as per the image below).

Any thoughts would be helpful!

Silly error on my part - my model’s scale was way off (too big). Shrunk the geometry back down to a workable size and it’s fine now (and running a lot smoother, hah!).