7W X9 Downlight Review

General Information

ID #353
SKU X9
Series N/A
Manufacturer Generic (other LEDs from Generic)
Fitting Type MR16 (other MR16 LEDs)
Light Type Downlight (PAR)
Height 110mm
Diameter PAR16 (50mm)
Weight 121g
Warranty 2 Years
Test Date 2015-08-06
Review Notes Off the shelf Chinese made product distributed by WattSaver. Marked with CE approval label. Tested using a OSRAM Redback 12VAC electronic transformer. Very high flicker percentage (94% - well above 10% recommended), flicker is subtle but visible. Measured CRI was a lot worse than claimed. Claimed light source: 7W Epistar COB chip. Lifetime not specified so a minimum of 15,000 hours is assumed.
Price $11 (AUD) from led-downlights.net.au on 5th of August 2015
Rating

 

LED Specifications

Claimed Measured Compared To
Watts 7W 9.7W @ 244V
Electronic Transformer
54.7W @ 12V
Yearly Running Cost[?] $1.53 $2.12 $11.98
Lumens 720 lm 564 lm 765 lm
Efficiency[?] 103 lm/W 58 lm/W 14 lm/W
Lumens/Purchase Price 65 lm/$ 51 lm/$ 170 lm/$
Power Factor[?] N/A 0.67 1
Color [?] Warm White Warm White, 3081K Warm White, 3015K
Angle[?] 60° 58° 45°
Dimmable Not Dimmable N/A Yes, Trailing Edge
CRI (Color Accuracy)[?] 80 62
Life 15,000 hours Not Measured 6,000 hours
Min/Max Voltage N/A / 12V N/A
Min/Max Temperature N/A / N/A N/A
Measured Temperature 77°C @ 25°C ambient
171°F @ 77°F ambient
256°C @ 25°C ambient
493°F @ 77°F ambient
Flicker Percent[?] 94% 3%
Flicker Index[?] 0.307 0.008

 

Link to manufacturer specifications at time of testing

 

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Distribution Graph

Angle: 58° (±29° from bottom), Maximum lux:

Graph notes: Shows the intensity of the light when viewed from different angles. Normal omni-directional globes have a fairly constant output all the way around (excepting directly above). Downlights have a narrow range at the bottom in which the light is emmited, this determines their angle.

 

Spectrum Graph

Representation of color spectrum

Graph notes: Shows the breakdown of the LED light into its component colors. With short wavelength ultraviolet on the left and long wavelength infrared on the right. The green line represents the relative absolute strength of the light at each frequency, while the red line represents what the typical human eye would see. The human eye is most sensitive to green light, but much less sensitive to purples and deep reds.

 

Flicker Graph

Graph of measured flicker

Percent: 94%, Index: 0.307 (lower is better in both cases)

Graph notes: Shows variation in light output over 1/10th of a second, with relative light output on the Y axis and time on the X Axis. Measured with a photodiode connected to an Oscilloscope. Ideally the yellow line should be flat. Low frequency high amplitude waveforms mean there is a possibility of noticeable flicker, but sensitivity to flicker varies between people. [More details about LED flicker]

 

Disclaimer: While every effort has been made to ensure the accuracy of these results, each measurement carries an inherent degree of uncertainty and error. Safety and EMC compliance of products to regional or international standards have not been verified unless noted as an ENERGY STAR® LED Lighting Facts, or SSL Quality Scheme certified product. Retailers and importers selling unmarked or unapproved electrical goods can be fined or imprisoned. Mains supplied downlights require installation by a licensed electrician.