I'd recommend changing to LED, but you have two strategies for that.
1: Buy the cheap bulbs from fleabay. I bought a good amount when they were a buck each, no shipping. However, they have an off glow and seem to turn my TT at night into a rendition of Minas Morgul.
2: Buy the better bulbs. The better bulbs tend to have a warmer light (easier on the eyes), and they also tend to have voltage regulation, so they don't burn themselves out when exposed to the 12-15 volt variances that happen on a rig's 12 volt rail.
The better bulbs last a long time, and it only hurts once to do the job right. Both use about 1/7 of the energy of a regular bulb of the same wattage, so will be easy on your wires and the battery.