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Bili Meter

Bili Meter Calibration Services Australia:

What Is the Bili Meter?

The Bili Meter is a specialized spectroradiometer crafted to measure the therapeutic light output of neonatal phototherapy lamps. It captures the blue-green light spectrum—specifically around 425–475 nm the critical range for breaking down bilirubin in newborns.

Bili Blanket Light Meter II

BiliBlanket* Light Meter II provides a reliable measure of light emissions from phototherapy systems.

Measuring Irradiance

The Bili-Meter is a spectroradiometer that measures the therapeutic irradiance (radiant power) of neonatal phototherapy lights. It measures the irradiance of the wavelengths from 425 to 475 nanometers (nm), the blue-green portion of the spectrum, which includes the principal action spectrum of bilirubin.

Units of Measurement

The Bili-Meter measures irradiance in units of microwatts per square centimeter per nanometer (pW/cm2/nm). A nanometer is a inmsure of wavelength equal to one-billionth of a centimeter. The term "per nanomcter" indicates the average irradiance per nanometer across the spectral hand being measured, which is 50 nm wide. This makes it possible to compare average irradiance across spectral bands of different widths.


Instrument Response Characteristics

Figure 4 represents the nominal response characteristics of the Bili-Meter, which matches the action spectrum of bilirubin as closely as possible.

Figure 4 Nominal response of the Bili-Meter


Frequently Asked Questions

The Bili Meter records light output in units of micro-watts per square centimetre per nanometre (µW/cm²/nm), representing the average radiant power per wavelength across the treatment spectrum. This standardization enables accurate assessment of phototherapy device effectiveness.

Calibration ensures that the Bili Meter continues to provide accurate measurements over time. Exposure to high-intensity phototherapy light can cause sensor drift. Routine recalibration maintains measurement precision, which is critical for ensuring neonatal safety and treatment efficacy.

For reliable performance, a Bili Meter should typically be recalibrated annually, or sooner depending on usage frequency and exposure levels. Regular calibration prevents drift in readings and ensures consistent monitoring of phototherapy device output.

Yes. The Bili Meter is engineered to be compatible with various phototherapy devices such as overhead lamps, LED blankets, or pads—with emphasis on the core bilirubin action spectrum. Its broad spectral response ensures versatile use across multiple clinical setups.