This article describes if there is any specific reasons to use the black or the white Anybus Wireless Bolt.
Anybus Wireless Bolt
Yes, the white Wireless Bolt is better compared to the black when the Bolt is exposed to sunlight.
This is because of the infra-red thermal heat-up caused by the black color, rendering higher temperatures inside the housing. This results in shorter lifetime of the electronics as well as overheating and potential shut down.