100W Led Grow Light Bulb
A lot of people are extremely confused about different lighting terms. Wattage is simply a measure of electricity usage. It has nothing to do with how much light a fixture generates, or for that matter, whether the type of light the fixture generates is actually good for plant photosynthesis.
Most people think of as light is measured in lumens. The more lumens a fixture generates per watt used, the more efficient the light fixture. Incandescent bulbs are very inefficient, and generate 10-15 lumens per watt . Fluorescent bulbs might get as high as 40-60 lumens per watt. Led fixtures can exceed 100 lumens per watt. So an led fixture can generate the same light, at 10% of the electricity cost, as an incandescent bulb.