Today I found some 36w and 40w lamps branded as "Ecolink" with green sleeves. It turns out, they are just rebranded philips lamps.
Firstly, on the sleeve it says "made by Signify (formerly philips lighting)".
Secondly, the tubes are very similar to philips tubes, down to the etch layout, endcaps, and date code.



Ecolink TL 40w/54
Ecolink TL 36w/54
Philips TL 40w/54
Philips TL 36w/54

Thats interesting how they have different date codes though