We have a lot of 1260s and 1290s in our lab, and as part of our sustainability initiatives are looking for ways to reduce our energy usage. Currently, all the instruments are left on (standby), and most of them also have the lamps on when not in use. We are considering turning off the stack or just the lamps in between uses. One concern is that repeatedly turning the lamp on and off also reduces the lamp lifetime. Is there a recommended balance between leaving the lamp on to reduce ignitions, and turning off after use to reduce energy usage?