Antler light fixtures are very popular, but are also an expensive item. A large deer antler chandelier can easy cost thousands of dollars. They are also extremely heavy and therefore you may be restricted as to where you can hang them in your room - only a robust structural beam will do. A natural antler light fixture is also quite large - depending on the size of the original animals antler - ranging from the largest elk antlers down to smaller deer antlers.
So if either your budget or your room isn't large enough to feature a traditional antler light - don't give up yet there are options. To start of with if you want the look of antlers without either the weight or high price tag consider using buying fake or faux antlers. These are significantly cheaper and lighter - but obviously won't be for you in authentic is important in your rustic decor look.
Another option is to choose smaller light fittings which use antlers in their design. Options include side lights and scone lights. You can buy bar lights which are constructed of a number of smaller (three, five or seven) light fittings on one medium sized antler - and are designed to be either ceiling hung or attached to a wall bracket.
Another option is to consider free-standing floor lamps. These work particularly well if you are unsure that you want to live with a antler-themed decor long term. You can try it out so to speak, and then sell the item if you grow bored with the look. This is also an ideal compromise for those people who live in rental or temporary accommodation, where the landlord is unlikely to be happy about you installing antler lights in their property!
Whatever choice you make regarding antler light fixtures you really need to plan out the entire lighting scheme to ensure that your room will not just look attractive but also have the appropriate light levels in the right places. A mixture of general background lighting and spot lights are what usually work best in these cases.