Question 1

Does the inverse square law apple? (2 times recc. distance requires 4 times exposure)

Accepted Answer

The change in the intensity of light follows the inverse square law.  The intensity of light decreases by 1/(distance squared) But that doesn’t necessarily equate to the exposure time required by the person using the light.  In general the exposure time for light therapy will increase as the intensity of the light decreases but since everyone has different number of receptors in the back of their eyes and the function and secretion from their pineal gland is also likely different, we don’t believe exposure time will follow any mathematical formula.

Feel free to give us a call in Vermont at 1-800-786-6850 or email us at hello@verilux.com if you have any other questions or concerns.

Question 2

How is this different from the $79 model?

Accepted Answer

This model is designed to be simpler to use with just an adjustable brightness control.  The $79 model (I am assuming model VT32) allows you to adjust the color from day light to warm white for added comfort.

Feel free to give us a call in Vermont at 1-800-786-6850 if you have any other questions!

Question 3

Is this rechargeable batteries or 110 volt

Accepted Answer

This does not have rechargeable batteries.  It must be plugged in.   The power supply is designed to accept anywhere from 110V to 240V. However, please note that this item does not come with a plug adapter and is only ETL and UL certified in the U.S. & Canada.

Feel free to give us a call in Vermont at 1-800-786-6850 or email us at hello@verilux.com if you have any other questions or concerns.

Question 4

How does this differ from the VT22? (I have that one & like it)

Accepted Answer

I first ordered the VT22 and returned it for this model.  This one has a MUCH better stand that is on the bottom and isn't easily knocked over.  It also has 3 levels of brightness.  It is almost the same size.  I think it is a little taller and a little narrower, but not enough to make a difference.  I really love the VT31 over the VT22 and the larger one that I tried out first.

ASIN	B08BCLLYN5
ASIN	B08BCLLYN5
Additional Features	Adjustable Brightness, Full Spectrum, Timer
Age Range Description	All ages
Base Material	Plastic
Best Sellers Rank	#17,289 in Health & Household ( See Top 100 in Health & Household ) #11 in Light Therapy Products
Brand Name	Verilux
Bulb Base	GU10
Bulb Shape Size	T
Color	White
Connectivity Protocol	USB
Connectivity Technology	USB
Control Method	Touch
Controller Type	Touch
Customer Reviews	4.5 4.5 out of 5 stars (4,281)
Date First Available	January 1, 2025
Efficiency	Energy-efficient
Finish Types	Matte or Glossy
Included Components	Stand
Indoor Outdoor Usage	Indoor
Installation Type	Wall Mount
Is Waterproof	False
Item Dimensions D x W x H	0.98"D x 5.63"W x 9.01"H
Item Weight	2 pounds
Item model number	VT41WW3
Lamp Type	Light Therapy Lamp
Light Source Type	LED
Lighting Method	Adjustable
Manufacturer	Verilux
Manufacturer	Verilux
Material Type	Plastic
Model Number	VT41WW3
Mounting Type	Desktop
Number of Items	1
Number of Light Sources	1
Number of Pieces	1
Power Source	Corded Electric
Product Dimensions	5.63 x 0.98 x 9.01 inches; 2.01 pounds
Recommended Uses For Product	Therapy for Improving Sleep, Mood, Focus and Energy
Room Type	Office
Shade Color	White
Shade Height	22.88 centimeters
Shade Material	Plastic
Shape	Rectangular
Specific Uses For Product	Seasonal blues, insomnia, sunlight deprivation
Style Name	VT41WW3
Switch Type	Push Button
UPC	768533140081
Unit Count	1 Count
Voltage	240 volts_of_alternating_current
Water Resistance Level	Not Water Resistant
Wattage	10 watts

Verilux HappyLight Lumi Plus - Light Therapy Lamp with 10,000 Lux, UV-Free, LED Bright White Light with Adjustable Brightness, Countdown Timer, & Detachable Stand - Boost Mood, Sleep, and Focus

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