Standard bulbs have a lifespan of 1000 hours, but you can replace them when they reach 700 hours of use. It equals to 42000 minutes and thus 2100 sessions of 20 minutes each. If you use the tanning bed once a day, the bulbs can amount to 6 years. When you think about it, the bulbs are not going waste at all. After 6 years, the inner details of the bulbs wouldn’t remain the same even if you don’t use it. Replacing them on time is better than waiting for an issue to arise to take action.