It's an IKEA Tertial lamp, coming without a bulb, and in the blurb they recommend 'LEDARE LED bulb E27 8.1W 400 Lumen'.
The bulb I have in it at the moment is
ES0806G7/E12 7W
120mA 290lm 2700K
AC120V/60Hz 1033
which is a C7 with an E12 base and 7 watt, I am told.
Would one of these...