The DQG Fairy is already about two years old, but I couldn't find any measurement on it so bought one and tested. It's an ultrasmall (31,2 x 12,8 mm) and lightweight (10 g) keychain flashlight, which uses a 10180 lithium ion cell. The battery has to be purchased separately. I used a DQG branded 70 mAh battery. The battery can be charged via usb with an optional accessory.
The light has two modes which are activated by turning the head. Low mode activates first and high mode after additional clockwise rotation. The head is tight and difficult to operate with one hand. There's no knurling either, which makes things worse. Claimed runtime is 10-15 minutes on high and 4-5 hours on low. In practice the high mode lasts just about 20 minutes to 50 %. I didn't measure the low mode.
The light is available with two emitters. I measured the natural white version with a Cree XP-G2 R5 4C LED. There's also a cool white version with a XP-G2 R5 1A emitter with a claimed color temperature of 6500 K.
The beam is pure flood with a 128° angle. There's no hotspot.
There is no PWM.
DQG Fairy, DQG Tiny AAA 7, AAA alkaline battery
Measurements
Please note: lumen measurements are only rough estimates
My diy integrating styrofoam box cooler has been calibrated using a Fenix E05 on high with manufacturer's claim of 85 lumens. Verified with an Olight S10 that has been measured with a Labsphere FS2 integrating sphere by valostore.fi. Results may be more inaccurate with especially throwy or floody lights.
For spectral information and CRI calculations I have an X-rite i1Pro spectrophotometer with HCFR for the plot and ArgyllCMS spotread.exe for the data. For runtime tests I use spotread.exe with a custom script and a i1Display Pro because it doesn't require calibration every 30 minutes like the i1Pro.
Explanation of abbreviations
CCT = correlated color temperature, higher temperature means cooler (bluish)
CRI (Ra) = color rendering index consisting of 8 different colors (R1-R8), max value 100
CRI (R9) = color rendering index with deep red, usually difficult for led based light sources, max value 100
TLCI = television lighting consistency index, max value 100
x,y = coordinates on a CIE 1931 chart
Spectral distribution
Tint
Runtime
The light has two modes which are activated by turning the head. Low mode activates first and high mode after additional clockwise rotation. The head is tight and difficult to operate with one hand. There's no knurling either, which makes things worse. Claimed runtime is 10-15 minutes on high and 4-5 hours on low. In practice the high mode lasts just about 20 minutes to 50 %. I didn't measure the low mode.
The light is available with two emitters. I measured the natural white version with a Cree XP-G2 R5 4C LED. There's also a cool white version with a XP-G2 R5 1A emitter with a claimed color temperature of 6500 K.
The beam is pure flood with a 128° angle. There's no hotspot.
There is no PWM.
DQG Fairy, DQG Tiny AAA 7, AAA alkaline battery
Measurements
Please note: lumen measurements are only rough estimates
My diy integrating styrofoam box cooler has been calibrated using a Fenix E05 on high with manufacturer's claim of 85 lumens. Verified with an Olight S10 that has been measured with a Labsphere FS2 integrating sphere by valostore.fi. Results may be more inaccurate with especially throwy or floody lights.
For spectral information and CRI calculations I have an X-rite i1Pro spectrophotometer with HCFR for the plot and ArgyllCMS spotread.exe for the data. For runtime tests I use spotread.exe with a custom script and a i1Display Pro because it doesn't require calibration every 30 minutes like the i1Pro.
Explanation of abbreviations
CCT = correlated color temperature, higher temperature means cooler (bluish)
CRI (Ra) = color rendering index consisting of 8 different colors (R1-R8), max value 100
CRI (R9) = color rendering index with deep red, usually difficult for led based light sources, max value 100
TLCI = television lighting consistency index, max value 100
x,y = coordinates on a CIE 1931 chart
Spectral distribution
Tint
Runtime
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