Please be aware that in the coming months it will no longer be possible to create custom whitelist entries on the Hue bridge. The randomly generated bridge username must be used instead.
It is anticipated this change will be rolled out to the public in April 2016.
This means that if you have developed a Hue Library or have a Hue app in the market which uses a custom whitelist username the bridge authentication will start failing after this date. So of course, if this is the case for your app/library it is strongly advised for you to update your app/library in the coming months to use the randomly generated bridge username.