Verilux HappyLight · $$$ · Updated March 3, 2026
Duo Floor
A top-10 lamp for melanopic output, #10 of 57. No flicker at any setting. Glare is harsh up close.
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Is it strong enough?#10 of 57
Close. 99% of the 10,000 lux benchmark at 1 ft.
9,885 m-EDI at 1 ft · 2,705 at 2 ft
Is it comfortable to sit in front of?6th harshest
Harsh up close.
431 at 1 ft · 119 at 2 ft · median 112
Does it flicker?No risk
No, at full power or dimmed.
2.1% modulation at max
Flicker index
0.0033
SVM
0.031
What does the light look like?4900K
Neutral white, decent color.
CRI Re 88 · R9 70
2700K warm7500K cool
All test data
Light outputMeasured at 1 ft and 2 ft
m-EDI
9,885
2,705 at 2 ft
Lux
11,245
3,115 at 2 ft
CLa
18,805
4,380 at 2 ft
Glare
431
119 at 2 ft
m-EDI 9,885 at 1 ft, 2,705 at 2 ft
Median 3,43010,000 benchmark2 ft1 ft
Glare 431 at 1 ft, 119 at 2 ft
Median 1122 ft1 ft
SpectrumOutput at the highest setting
Melanopic DER
0.88
m-EDI per lux. Daylight (D65) is 1.0.
CCT
4900K
3 levels
Gap from natural light
32%
Far. Average spectral difference (ASD) from natural light 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
Percent flicker
2.1% · n/a
Flicker index
0.0033 · n/a
SVM
0.031 · n/a
PstLM
0.044 · n/a
Assist Mp
0.032 · n/a
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
88
R9 (deep red)
70
TM-30 Rf
90
TM-30 Rg
102
Neutral saturation
Specifications
- Form factor
- Floor standing
- Brightness
- 5 levels
- Color temperature
- 3 levels
- Power
- 34 W
- Voltage
- 100-240V
- Cord length
- 6 ft
- Mounting
- None
- Extra features
- None
- Available in
- United States, Canada
