A sign light to illuminate a sign such as a real estate sale sign. The sign light is configured to suspend between the crossarm of a sign post and the sign. The sign light includes a housing, a light source, and sign mounting hardware. The housing allows the sign light to suspend from a crossarm of a...http://www.google.com.tw/patents/US7748863?utm_source=gb-gplus-share專利 US7748863 - Solar light apparatus and system
