Luminous Efficacy Converter

Result:

From:

To:

Supported units

Convert between lumen per watt (lm/W), lumen per milliwatt (lm/mW), lumen per kilowatt (lm/kW), and the photopic maximum (683 lm/W). Exact relationships are used.

Popular pairs

lm/W <-> lm/mW
lm/W <-> lm/kW

How to use

Pick your from/to units using the search boxes, enter a value, and the result updates instantly. Use the copy button to grab the output.

Related converters

Luminous Efficiency Converter
Luminous Flux Converter (lumens)
Luminous Intensity Converter (candela)

Luminous Efficacy Converter FAQ

Are the conversions exact?

Yes. We use exact relationships and the photopic maximum of 683 lm/W.

Can I convert between lm/W and lm/mW?

Yes. Enter your value in lm/W and select lm/mW as the target (or vice versa); results update instantly as you type.

Does this handle very small or very large efficacy values?

Yes. You can convert down to lm/mW or up to lm/kW with high precision using Decimal arithmetic.