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SPF stands for Sun Protection Factor. In general, you don't need to wear a tanning lotion with SPF. There are specific tanning lotions for indoor tanning, however, that uses SPF for people who may be more sensitive to UV light. A professional at the tanning salon may recommend you use a tanning lotion to protect your skin if you need to.
Tanning lotions with SPF may not block you from tanning but it will help your skin if it is more sensitive. You can tan longer without getting a sunburn.