Oven Lamp, Philips 15 watt E14 SES (Small Edison Screw) oven lamp, 250 degree, 45mm long. Often if your oven is fitted with this lamp "15 watt" will be stamped into the glass cover. Note that 15 watt lamps can be fitted to 25 watt lampholders (but will be dim) however 25 watt lamps cannot be fitted to 15 watt lampholders.