When I bought 84G, she had an unauthorized mod to the landing/taxi light circuits. The previous owner, noting that the bulbs were rated at 12v (not 13.8v normal operating voltage) used Ohms law to discover what size high current resistors he needed to drop the voltage at the bulb back to 12v. He then installed these resistors in a small box mounted near the (wing mounted) bulbs, electrically connected between the bulbs and their switches. He claimed this eliminated frequent bulb replacment, and did not affect intensity enough to notice, day or night. I used his system for a short time before removing it and sending it back to him (part of the deal) and found his intensity claims to be true. I do not fly with the landing/taxi lights on, except in higher traffic areas (I've installed strobes), and do not have to frequently replace bulbs, but his system does seem to have some merit, if I wanted to build one and get it approved.
