Heat a charcoal or gas grill to medium-hot (you can hold your hand 1 to 2 in. above cooking grate only 3 to 4 seconds). Combine chiles, butter, honey, garlic, and salt in a blender and whirl until smooth.
Put unhusked corn on grill and cook, turning occasionally, 15 minutes. Husks will blacken. Transfer to a work surface, remove husks, brush ears generously with butter mixture, and return ears to grill. Grill until lightly browned, about 5 minutes. Serve warm, with remaining butter.
Note: Nutritional analysis is per ear.