49685d02_nt_Convention___iusmentis_com___Basis_in_priority_document
[Claim] A bicycle comprising the lamp of claim 1, said lamp being connected to a dynamo as power source. [Benefit of priority?] Yes. Bicycle, lamp and dynamo are mentioned in combination. From "be powered by the dynamo" the skilled person would immediately derive that lamp and dynamo are connected. [Basis in priority document] 
"This lamp can be used in vehicles such as bicycles. In bicycles the lamp could then be powered by the dynamo."
Priority under the European Patent Convention (EPC) (in Patents > European Patent Convention @ iusmentis.com)
Basis in priority document