49685d02_nt_Convention___iusmentis_com___Basis_in_priority_document
[Claim] A lighting arrangement comprising three lamps according to claim 1. [Benefit of priority?] No. The sentence does not directly and unambigously disclose three lamps specifically. [Basis in priority document] 
"A plurality of lamps can be installed in a device such as a flashlight to increase light output."
Priority under the European Patent Convention (EPC) (in Patents > European Patent Convention @ iusmentis.com)
Basis in priority document