led - correct spelling
Not lead.
Note: The word lead is not the past tense and past participle of the verb lead. The word led is the correct past tense and past participle. For a discussion of the differences between led and lead, read chapter 10 in the section on Grammatical Mistakes.
Example: He led the orchestra. past tense
Example: She led me astray. past tense
Example: He has led the orchestra. past participle