Shine Potion

The light comes from you, and that is the whole argument for it. A Shadow Orb or Crimson Heart trails behind and snags on corners the moment you start moving quickly. A Mining Helmet takes your head slot and gives you a narrow cone. This lights a wide circle in every direction while you wear whatever armor you actually want.

The problem is that the ingredients compete with better potions, and once a light pet is following you the gap narrows a lot. Save it for long dives and for swimming, where the alternatives dim out and you want the whole cave visible at once. It turns up often enough in pots, chests and crates that most players never brew one deliberately.