9W Daylight LED Lamp Review

General Information

ID #324
Series N/A
Manufacturer E-Star (other LEDs from E-Star)
Fitting Type GU10 (other GU10 LEDs)
Light Type Downlight (PAR)
Height 80mm
Diameter PAR16 (50mm)
Weight 81g
Warranty 1 Years
Test Date 2014-11-19
Review Notes Lamp carries RCM approval marking. Die-cast aluminium casing. Claimed light source: High efficiency COB LED chip. We were unable to find any details about the warranty period, so are assuming 1 year. Uses significantly less power than the claimed 9W, while also emitting less light. CRI and power factor are both pretty ordinary. Good efficiency and low price are the redeeming features.
Price $11 (AUD) from ElectricianSupplies.com.au on 12th of November 2014


LED Specifications

Claimed Measured Compared To
Watts 9W 6.7W @ 243V 50.2W @ 242V
Yearly Running Cost[?] $1.97 $1.47 $10.99
Lumens 570 lm 475 lm 498 lm
Efficiency[?] 63 lm/W 71 lm/W 10 lm/W
Lumens/Purchase Price 52 lm/$ 43 lm/$ 144 lm/$
Power Factor[?] N/A 0.51 1
Color [?] Cool White, 6000K Cool White, 6100K Warm White, 2737K
Angle[?] 50° 56° 33°
Dimmable Not Dimmable N/A Yes, Leading or Trailing Edge
CRI (Color Accuracy)[?] 75 76
Life 50,000 hours Not Measured 2,000 hours
Min/Max Voltage N/A / 240V 220V / 240V
Min/Max Temperature N/A / N/A N/A
Measured Temperature 60°C @ 25°C ambient
140°F @ 77°F ambient
192°C @ 25°C ambient
378°F @ 77°F ambient
Flicker Percent[?] 2% 9%
Flicker Index[?] 0.003 0.029



Distribution Graph

Angle: 56° (±28° 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: 2%, Index: 0.003 (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.