Are you using both bulbs in the same fixture? Switching out bulbs daily will drastically shorten their lifespan because of constant heating up and cooling down. If you only have one fixture then just stick with a black or red light bulb on for 24hrs.
I have a fixture on a timer that has both a day and night bulb in it, and then a separate smaller fixture that now has a CHE in it. We'll see how it works out.