Verilux HappyLight · $$ · Updated March 3, 2026
Duo Desk
Ranks #25 of 57 for melanopic output, below the 10,000 lux benchmark at 1 ft. No flicker at full power.
Affiliate disclosure: this page contains affiliate links. I may earn a commission at no extra cost to you.
Is it strong enough?#25 of 57
No. Only 37% of the 10,000 lux benchmark at 1 ft.
3,660 m-EDI at 1 ft · 1,025 at 2 ft
Is it comfortable to sit in front of?Standard
Mostly. Moderate glare.
216 at 1 ft · 61 at 2 ft · median 112
Does it flicker?No risk
No, at full power. Dimmed not tested.
0.6% modulation at max
Flicker index
0.0007
SVM
0.003
What does the light look like?5550K
Cool daylight, excellent color.
CRI Re 95 · R9 96
2700K warm7500K cool
All test data
Light outputMeasured at 1 ft and 2 ft
m-EDI
3,660
1,025 at 2 ft
Lux
4,145
1,180 at 2 ft
CLa
6,160
1,545 at 2 ft
Glare
216
61 at 2 ft
m-EDI 3,660 at 1 ft, 1,025 at 2 ft
Median 3,43010,000 benchmark2 ft1 ft
Glare 216 at 1 ft, 61 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
5550K
3 levels
Gap from natural light
17%
Moderate. 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 not tested
Percent flicker
0.6%
Flicker index
0.0007
SVM
0.003
PstLM
0.018
Assist Mp
0.015
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
95
R9 (deep red)
96
TM-30 Rf
91
TM-30 Rg
100
Neutral saturation
Specifications
- Form factor
- Desktop
- Brightness
- 7 levels
- Color temperature
- 3 levels
- Power
- 16 W
- Voltage
- 100-240V
- Cord length
- 5.9 ft
- Mounting
- None
- Extra features
- USB charging port
- Available in
- United States, Canada
