Watts (W) is a unit of power that measures the rate of energy consumption. In lighting, it represents the amount of electricity a light bulb uses. Lumens (lm) is a unit of luminous flux, which measures the total amount of visible light emitted by a source. It quantifies how bright a light appears to the human eye.

The formula for converting watts to lumens is:

\[\text{Lumens} = \text{Watts} \times \text{Luminous Efficacy}\]Where:

- Lumens = Light output
- Watts = Power input
- Luminous Efficacy = Efficiency of the light source (lm/W)

- Determine the power input in watts (W) of your light source.
- Identify the luminous efficacy (lm/W) of your light source. This varies depending on the type of bulb.
- Multiply the watts by the luminous efficacy to get the lumen output.

Let's calculate the lumen output for a 60W incandescent light bulb:

- Power input = 60W
- Luminous efficacy of an incandescent bulb ≈ 15 lm/W
- \[\begin{align} \text{Lumens} &= 60 \text{ W} \times 15 \text{ lm/W} \\ &= 900 \text{ lumens} \end{align}\]

This diagram illustrates how a 60W incandescent light bulb produces approximately 900 lumens of light output. The yellow circle represents the relative brightness of the light source.

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