How many lumens are in a 300 watt incandescent light bulb?

The actual amount of light (lumens) given off by a bulb depends on the how the bulb was made and with what materials. It depends on the filament material, its length and thickness, and the type of gas in the bulb. As a rule, longer lasting bulbs of the same wattage will generally be less bright than others and brighter bulbs of the same wattage will not last as long as other bulbs.

Sample lumen outputs:

• Sylvania 250 Watt Indoor Soft White 3-Way Bulb can emit 3940 lumens at its highest setting.
• Philips 250 Watt 120 to 130V PAR38 Krypton Flood Bulb emits 3100 lumens