Circadian Optics · $$$ · Updated October 14, 2026
Langley
A top-10 lamp for melanopic output, #4 of 57. No flicker at any setting.
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Is it strong enough?#4 of 57
Yes. 2.7× the 10,000 lux benchmark.
26,560 m-EDI at 1 ft
Is it comfortable to sit in front of?Standard
Mostly. Moderate glare.
112 at 1 ft · median 112
Does it flicker?No risk
No, at full power or dimmed.
0.1% modulation at max · 0.2% dimmed
Flicker index
0.0001
SVM
0.003
What does the light look like?5800K
Cool daylight, excellent color.
CRI Re 98 · R9 98
2700K warm7500K cool
All test data
Light outputMeasured at 1 ft and 2 ft
m-EDI
26,560
n/a at 2 ft
Lux
28,050
n/a at 2 ft
CLa
55,460
n/a at 2 ft
Glare
112
n/a at 2 ft
m-EDI 26,560 at 1 ft
Median 3,43010,000 benchmark1 ft
Glare 112 at 1 ft
Median 1121 ft
SpectrumOutput at the highest setting
Melanopic DER
0.95
m-EDI per lux. Daylight (D65) is 1.0.
CCT
5800K
Fixed
Gap from natural light
8%
Very close. Average spectral difference (ASD) from daylight at the same color temperature, 425 to 690 nm.
Lamp outputBody-clock zone (melanopic, CIE S 026)Natural light, same color temperature
FlickerGreen is safe, amber is acceptable, red is past the limit
Full powerDimmed (Halfway (50%))
Percent flicker
0.1% · 0.2%
Flicker index
0.0001 · 0.0005
SVM
0.003 · 0.004
PstLM
0.007 · 0.050
Assist Mp
0.010 · 0.010
Waveform, 1 second
A flat line near 1.0 means steady light.
Color renderingHow accurately colors and skin tones look under this lamp
CRI Re
98
R9 (deep red)
98
TM-30 Rf
96
TM-30 Rg
100
Neutral saturation
Specifications
- Form factor
- Floor standing
- Brightness
- Continuous
- Color temperature
- Fixed
- Power
- 141 W
- Voltage
- 100-240V
- Cord length
- 9.3 ft
- Mounting
- None
- Extra features
- Works with a smart plug
- Available in
- United States, Canada
