What should I look for in a light therapy device?
There are hundreds of light therapy products available now and it can be difficult to know where to start. We've come up with a checklist of things to look for when buying light therapy, whether that's from Lumie or another light therapy specialist.
The following are guidelines for ALL light therapy products:
Product should be certified as a Medical Device If a product description states that it's a 'Treatment for SAD', unless it's certified as a Medical Device you really have no guarantee that it's been designed to be used as such. In addition, a product classed as Medical Device must conform to European manufacturing standards and carry the correct mark (e.g. CE0473).
Clear guidelines for treatment time AND distance Light intensity drops dramatically over distance. Some individuals will prefer to use their device up close so it's brighter and allows for a fast treatment time; others may opt to use the same light further away for a longer, low-intensity session. Information should be available that allow users to make a choice.
Harmful UV (ultra-violet) light should be filtered out Most people are now aware of the dangers of UV and properly designed light therapy products will incorporate special screens and filters ensuring that UV levels are negligible.
Demonstrable efficacy in clinical trials This could mean the actual product has been tested (e.g. our Bodyclock range has been used in clinical trials) or - more commonly - that previous clinical trials have shown the same type of light exposure to be benficial (e.g. Arabica).
Opportunity to try the product at home For most people light therapy makes a real difference but if you're sceptical it can seem like an expensive risk. Reputable companies will offer a trial period so that you can make sure it works for you.
The following are extra points to check for when buying a SAD light:
Lux measurements should be linked to distance A product description promising 10,000 lux is meaningless if it's not linked to distance as well. If the manufacturer has taken this reading only centimetres from the screen then you will not receive 10,000 lux when you have it positioned at arm's length away from you - it could drop to only 500 lux. Users should always follow the manufacturer's recommendations when positioning their lightbox for treatment.
Use of blue light alone is still being investigated Whilst wavelengths in the blue part of the spectrum are most effective at influencing the circadian clock and are beneficial in treating SAD and circadian disorders, there is currently nothing to suggest that blue light on its own is better than full spectrum light therapy. Furthermore, there are no studies into the long-term effects of using blue light only.