Depending on the situation, you will at some point, if not often, have someone doing work for you that knows more about a topic or component. Understand that you don't have to know more or everything to be a good leader.
A very important point, and true of anyone holding any form of seniority in a position, but especially as a team lead. Always remain humble and accept that your team can have abilities and understanding beyond yours.
But, as an alternative to 3, and possibly an extension of 4, when you have an idea/experience of a solution to a problem but your team does not, create a dialogue whereby your questioning of their approach allows them to find your solution by themselves. You can pass on skills and techniques you've learnt in a manner where they learn them too rather than being told of the solution. Your team will feel proud of their solution and you can be happy knowing you are cultivating a strong learning environment.
But I also feel that it is important that you should see yourself as the one that also include the business goals into the development team.