So far I'm impressed with this little thing, it's quite powerfull for its size and I like that each bulb has both NIR and red. The battery is also great but I haven't tested if it really lasts 2 hours, the product listing doesn't specify if 2 hours is with all LEDs on or only NIR or RED. For some reason I was expecting each bulb to have 3 LEDs (one for 620,670 and 810) but each bulb has only 2 LEDs (one for 810 and one for either 620 or 670). I also wish it had dimming, when I point it at my face (great for eye health btw) it's so bright I have to squeeze my eyes shut especially since the beam angle is so narrow that holding it farther away makes no difference. Because of that narrow beam angle I feel like I have to hold it 6-12 inches away for the light to really spread out. I'm being nitpicky but I feel thats justified for a $375 product. Anyway I'm very excited to bring this on my cruise next week for sunburn mitigation. I think the product is great but I hope they provide more information in the discription such as battery capacity, how much power from each wavelength, etc.