Earliest suggest solo 15 watt light bulbs Sheer nut Volcano
Candex Lighting 15 Watt (100 Watt Equivalent), A21 LED, Dimmable Light Bulb, E26/Medium Standard Base & Reviews - Wayfair Canada
Status 15 Watt Oven Lamps with Screw Fitting - Twin Pack - Ray Grahams DIY Store
Bulbmaster 15W Himalayan Salt Lamp Bulbs and Night UK | Ubuy
E14 Light Bulb 15W - 25W – Hotel Organic
Pack of 3 x Bell 02431 15 Watt Oven Light Bulbs 300 Degree - Small Edison Screw SES E14 230/240V AC Clear + Free LED Keyring Torch : Amazon.co.uk: Lighting