Cappa in 'Le Genie Verrier de l'Europe' suggests that Verlux was an Etling mark. This appears to be based on spurious reasoning; as I understand Etling was a retailer whose commissions were made at Choisy le Roi or Sevres, so is unlikely to have commisioned pieces under a different name. I believe the attribution is based on the similarity of a pinecone pattern found on a Verlux tray with that seen on a known Etling vase; hardly conclusive given that Verlys and Jobling to name but two also produced similarly themed conifer patterns. The Etling/ Verlux myth has, however, since been repeated many times on ebay descriptions, etc.
The Verlux pieces I have handled, however, were of similar quality of finish to Choisy le Roi production, so I wouldn't be surprised if they produced some pieces marked Verlux. Holophane produced Verlys glass and I am not aware of any association with Verlux, though my knowledge in this area is hardly exhaustive. Certainly the finishing and feel of Verlux glass differs from that seen on most Verlys production. I don't have Decelle's 'Opalescence le Verre Moule des Annees 1920-30' immediately to hand but from what I recall it simply illustrates some Verlux production with no information as to who might have made it.