{"NAME":"Teckin SB50","GPIO":[0,0,0,0,40,0,0,0,38,39,37,0,0],"FLAG":0,"BASE":18}

See Tasmota documentation on how to configure RGBW lights to your needs.

Note: Although the product link shows E27, the model on the box is SB50

On my recent bulb (Sept 2019) the template needed is:

{"NAME":"Teckin SB50","GPIO":[0,0,0,0,37,0,0,0,38,40,39,0,0],"FLAG":0,"BASE":18}

15/August/2020 I can control the whites on mine with the template:

{"NAME":"Teckin_SB50","GPIO":[0,0,0,0,37,40,0,0,38,41,39,0,0],"FLAG":0,"BASE":18}