• We offer the largest selection of solar powered sign lights in the world. Solar Illuminations specializes in sign lighting systems and we have systems suitable for any sized sign, internally or externally lit. Many signs are installed where there is no electricity. If a sign or advertisment is not lit up at night time then you lose 50% of exposure every 24 hours. For business owners it is very important to have signage lit during the hours of darkness. Many signs are located some distance away from electrical power. Therefore using a solar powered system is an ideal solution to this problem and is also a green alternative to using electric power.