Has anyone ordered Lumen?
Looks intriguing however… I need to brush up on how well it performed agains gold standard-tools.
It sure does looks like a nice product for us data-obsessed-weight-crazy-cyclists.
What do you think?
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I looked through the summary that is linked on the website. As it was published by the company, keep that in mind, but it appeared fairly close to standard metabolic carts. Like any of these trackers (Whoop, Oura Ring, etc), you have to ask yourself what you would change and benefit by spending the mon.ey
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i contacted them a wee or so and asked if it could be used during exercise to determine what ratio of fat/carbs you were burning at varying intensities. No response from them so i guess no.
Well Whoop is nothing special at all as it tracks H/R. This actually serves a purpose for me with regards to determining that I’m either training with the correct carb/fat-inclination.
I found a video of Michael Andrew, some sort of swimmer, using it. Training With LUMEN - YouTube
Probably sponsored but who knows. It could be a great gizmo especially tracking RER.
@carytb check out the video above. That probably answers your question. You have to do a bit of calibration every time you want to use the device so I think it might be a bit of a hassle to do on the bike/while exercising. Not answering questions however is not good.
I have also been curious as to how accurate it is, and how it could help!! I hope the TR boys test it 
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Anyone actually purchased one of these? I see that they have Chris Froome advertising it now*
*not that I think he uses it in any meaningful way, he probably has a fully equipped laboratory manned by robot monkeys at his disposal.
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Then why did Froome have to go hat-in-hand trying to find someone to do physiological testing a few years ago to “prove” he’s not a doper? Wasn’t the claim that he’d only been tested once before, during his Barloworld days?
Any updated experiences with the Lumen tracker? I’m looking to get one
I’m a nutritionist and heard about Lumen last year through clients. The science behind it seemed kind of vague and there were not many online reviews at that time (that weren’t put up by the company), I had to write a paper for school on a tracking device so I chose Lumen. I’ll spare the whole paper but my findings were that it does not work well for endurance athletes. It’s possibly a useful tool for the general population who are willing to eat a low carb diet and exercise moderately. I tried for 30 days but never got into “fat burning” mode according to the device (I was riding 12 plus hours per week at the time and even when I tried tweaking my diet to be more protein/fat heavy, I barely noticed a difference on the device but felt terrible riding) It’s also very time consuming, having to use it multiple times per day to get a good data set. It has the potential to create stress and disordered eating imo. Some good points: easy user interface with the app and an online support community that really hypes up the positives (Lumen moderate the Facebook group and remove any negative feedback). TL;DR not a useful tool for athletes who need to eat carbs to support training, performance and overall health. If you try it let me know how it works for you!
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I used it for a bit and like @whatsername I never got into “fat burning” mode. It is worth noting that you have to be pretty diligent about tracking your types of food to get the full benefits of the device. It also does not really measure your metabolism, at least in a quantitative way.
For instance, it does not give you your RMR, etc.
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Thanks for the feedback, you saved me $300. Next beers on me 
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Great, detailed, informed feedback. Thank you so much! I’m on their list and have considered, this gives me what I need to know!!
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