An oven bulb can work as a tungsten-like source, but it will not necessarily match a standard household incandescent exactly. Tungsten lamps vary in color temperature by wattage, design, and operating voltage, so there is no single “tungsten color.” Typical incandescent sources are roughly in the 2500–3200 K range, while photo lamps can be higher.

For calibration, the safest approach is not to assume the bulb is a specific color temperature. Instead, photograph a white reference, gray card, or color checker in the same light you’ll use for the device. That gives you a reliable reference for correction regardless of whether the source is an oven bulb, enlarger lamp, slide projector lamp, or another tungsten lamp.

If you need a closer match to a known tungsten standard, a photographic tungsten lamp, projector/enlarger lamp, or even a specified automotive bulb may be easier to characterize than an unknown appliance bulb. If exact color is less critical, you could also use another controllable light source and correct with gels or in post.