' LP Essence Pro - National Photonic Ltd.

LP Essence Pro

£1,066.00 excluding VAT


The Asenstek Lighting Passport Essence PRO spectrometer, combined with the SGM APP is a powerful tool for Facility Managers and  Lighting Contractors

  • Lighting Passport Spectrometer
  • Stand
  • Charging adapter + cable
  • Calibration & Warranty certificates
  • Quick Start Guide
  • Firm-shell product protective case
  • Belt pouch
  • Flicker measurement
  • T/RH

Available on backorder


The Asensetek Lighting Passport spectrometer combined with the SGE APP is a powerful tool capable of making a broad array of lighting measurements among which are a core set of metrics that are indispensable to anyone wishing to obtain a definitive understanding of any light source.

Illuminance in lux

CCT – Correlated colour temperature expressed in Kelvin

Chromaticity (an objective specification of the quality of a colour regardless of its luminance presented in the CIE 1931 xy chromaticity space)

CRI Color Rendering Index. CRI is a quantitative measure of the ability of a light source to reveal the colours of various objects faithfully in comparison with an ideal or natural light source. Light sources with a high CRI are desirable in colour-critical applications.

Knowledge of Illuminance, CRI, CCT and Chromaticity is critical when designing a lighting installation, verifying performance both post installation as well as in years to come; for example, when assessing compliance to lighting manufacturers’ performance guarantees.

Specifications – Essence Pro

Iluminance: Lux (Minimum Measurable) 5
Illuminance Range: Lux (With Reliable Chromaticity) 100 – 50000
Illuminance Accuracy (@ 1000 Lux) 5.00%
Chromaticity Accuracy: X,Y (@ 1000 Lux) +/- 0.003
Chromaticity Repeatability: X,Y < 0.0015
Wavelength Range: nm 380~780
Resolution: Nm 10
CCT Accuracy (@ 1000 Lux) 3.00%
Dimensions (@ 1000 Lux) 68.5 x 17 x 56 mm
Weight (@ 1000 Lux) 79g

Measurements – Essence Pro

CCT – Correlated Colour Temperature
TM-30-15 – IES Method for Evaluating Colour Rendition ($50 IAP)
CRI (Re) – Colour Rendering
CRI (Ra) – Colour Rendering
CQS – Colour Quality Scale (NIST)
lux – Illuminance
Foot Candle
CIE 1931 – Chromaticity Coordinate
CIE 1976 – Chromaticity Coordinate
C78.37 7-2008
IEC-SDCM – Standard Deviation of Colour Matching
λp – Peak Wavelength
λD – Dominant Wavelength
Pe – Purity
Duv – Colour shift based on the CIE 1960 u-v coordinates
SP Ratio – Scotopic:Photopic Ratio
PPFD – Photosynthetic Photon Flux Density
TLCI (QA) – Television Lighting Consistency Index (European Broadcasting Union)
GAI – Gamut Area Index
Flicker Index
Flicker %
Flicker Frequency

National Photonic Ltd.