Simple mast refit ...
Put a 360 d "all around" anchor light at the top of your mast. Get a combination steamer and deck light to put just above the spreaders. I would think that you already have a hole for the steamer light wires. Use a 3/4" or 1" plastic conduit to run your wires. I used boat cable with 2 wires for the anchor light (+ and -) and boat cable with 3 wires for the combination. This requires 2 positives and a common negative. At the bottom of the mast I joined the 2 negatives together and used a 4-prong plug to connect the 3 positives and one common ground. You will want to use a 4-prong plug becasue they are readily available. I used 16 guage for the anchor light and 14 guage for the combination because the deck light is 20 watt (if I remember correctly - the anchor and steamer lights are less wattage, I think 10)and figure on a larger ground because it is common for the deck light and steamer. I used a 12 guage ground wire in the boat from the 4-prong plug back to the buss at the terminal because it is common for all three lights (that might be overkill but I don't care since it is a single wire and inside the boat. I used the wires that were already inside the boat for the anchor and steamer. I had to feed a new single wire positive for the new deck light and I used 14 guage for that. If you don't have a separate steamer, you may have to feed a positive lead inside the boat for that as well. Read up on the wiring requirements. Getting a book on boat electrics is a good investment. While you are at it, you should replace your VHF cable or add one for a masthead antennae. Also, install a new wind instrument if you don't already have one. Before I did the mast refit, I had a broken wind instrument. I had to look at the top of the mast to read the indicator which was a real problem with the bimini and if my wife was at the helm ... well forget it ... Because winds are so inconsistant on our lake, we have a tendancy to set our sails and steer for the optimal wind angle; otherwise, constantly adjusting the sails is a major nuisance. Now, when my wife or anybody else is at the helm, I set the sails and tell them to keep an eye on the wind instrument at the bulkhead and try to keep the needle on a desired angle. Our course adjusts as needed; but we're lake sailing and keeping a consistant heading isn't important. I love having the wind instrument and wouldn't consider going without it now. There's lots of interesting discussion about the anchor lights, but if you are like me, the anchor light simply isn't important, but I need a steamer for operating at night under power and the deck light was a nice addition. Like N&E said, the steamer is customarily about half way up the mast and facing forward but I think the technical requirement is that it is 225 d (they give it a number "points" if you read the specifications). If you are a lake sailor like we are, you may have the same needs.
