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