The relationship between watts (W) and lumens (lm) is not a direct one-to-one conversion because watts measure power consumption, while lumens measure the amount of visible light emitted by a light source. The number of lumens produced per watt depends on the efficiency of the light source, which varies depending on the type of lighting technology used (e.g., incandescent, LED, fluorescent).

To give you a rough idea of how many lumens a 240W light source might produce, let's look at the typical efficiency of different lighting technologies:

1. Incandescent Bulbs: These are the least efficient, producing about 10-17 lumens per watt. So, a 240W incandescent bulb might produce approximately:

   • 240W × 10 lm/W = 2,400 lumens (lower end)
   • 240W × 17 lm/W = 4,080 lumens (higher end)

2. Halogen Bulbs: Slightly more efficient than traditional incandescent bulbs, halogen bulbs produce about 12-22 lumens per watt. A 240W halogen bulb might produce:

   • 240W × 12 lm/W = 2,880 lumens
   • 240W × 22 lm/W = 5,280 lumens

3. Compact Fluorescent Lamps (CFLs): These are more efficient than incandescent bulbs, producing about 40-70 lumens per watt. A 240W CFL might produce:

   • 240W × 40 lm/W = 9,600 lumens
   • 240W × 70 lm/W = 16,800 lumens

4. LED Bulbs: LEDs are the most efficient, producing about 80-120 lumens per watt (or even higher for some high-efficiency models). A 240W LED might produce:

   • 240W × 80 lm/W = 19,200 lumens
   • 240W × 120 lm/W = 28,800 lumens

Summary

• Incandescent: ~2,400 to 4,080 lumens
• Halogen: ~2,880 to 5,280 lumens
• CFL: ~9,600 to 16,800 lumens
• LED: ~19,200 to 28,800 lumens

Important Notes:

• The exact number of lumens produced by a 240W light source depends on the specific technology and the efficiency of the bulb or fixture.
• Modern lighting, especially LED, has made it possible to achieve high lumen outputs with much lower wattage. For example, a 240W LED fixture could produce significantly more light than a 240W incandescent bulb.
• When purchasing lighting, always check the product specifications for the lumen output, as this is a more accurate measure of brightness than wattage.

If you are looking for a specific light fixture or bulb, it’s best to refer to the manufacturer’s specifications for the exact lumen output.