Documentation says that Lightning components can be enabled in Developer edition after registering a namespace. But Develop --> Lightning Components option is not available. Please help.
Sign up for a Winter '15 Pre-Release Org at https://www.salesforce.com/form/signup/prerelease-winter15.jsp
Its not working for existing developer org. Need to register a new org after registering follow this steps.
- a. Click Setup | Create | Packages and then click Edit. b. Click Continue. c. Type a namespace and then click Check Availability to see if it’s unique. d. Click Review My Selections and then Save e. From Setup, click Develop | Lightning Components. f. Select the Enable Lightning Components checkbox and click Save.
I followed this doc which worked for me.
From Winter '16 on, Lightning Components is automatically enabled so you will not see an "Enable Lightning Components" checkbox in setup. However, Lightning App Builder will say that Lightning Components is disabled by default and will not show any custom components or AppExchange components in the org.
You need to create a custom domain under Settings | My Domain and deploy it to all users. Once this is deployed, you'll be able to see Lightning Components in the App Builder, navigate to standalone apps using components, or test them from Dev Console.