9W CW COB LED Downlight Review

General Information

ID #316
Series 9W COB
Manufacturer starlight (other LEDs from starlight)
Fitting Type Kit (other Kit LEDs)
Light Type Downlight (PAR)
Height 80mm
Diameter PAR16 (50mm)
Weight 98g
Warranty 2 Years
Test Date 2014-09-08
Review Notes Driver carries RCM and CE approval markings. Claimed light source: 9W Epistar COB. Marketed as a 50W halogen globe replacement. Compatible dimmer types are not specified but dimming on a Clipsal 32E450UDM universal dimmer was acceptable (see results below). Dimming range was 0-100%, which is better than most other phase-cut dimmable LED drivers. While dimming did not result in any visible flicker, performance was not very smooth; its dimming range was mostly contained within a very narrow range of travel. This version is a very cool white (which also boosts efficiency compared to warm white, but gives a blue spike in the spectrum)
Price $24.20 (AUD) from www.l-e-d.com.au on 7th of September 2014


LED Specifications

Claimed Measured Compared To
Watts 9W 8.7W @ 241V 54.7W @ 12V
Yearly Running Cost[?] $1.97 $1.91 $11.98
Lumens 740 lm 641 lm 765 lm
Efficiency[?] 82 lm/W 74 lm/W 14 lm/W
Lumens/Purchase Price 31 lm/$ 26 lm/$ 170 lm/$
Power Factor[?] N/A 0.75 1
Color [?] Cool White, 6000K Cool White, 6092K Warm White, 3015K
Angle[?] 60° 70° 45°
Dimmable Yes, Trailing Edge Below average Yes, Trailing Edge
CRI (Color Accuracy)[?] 85 82
Life 40,000 hours Not Measured 6,000 hours
Min/Max Voltage 180V / 265V N/A
Min/Max Temperature N/A / N/A N/A
Measured Temperature 57°C @ 25°C ambient
135°F @ 77°F ambient
256°C @ 25°C ambient
493°F @ 77°F ambient
Flicker Percent[?] 24% 3%
Flicker Index[?] 0.068 0.008


Link to manufacturer specifications at time of testing


Dimming measurements

Graph notes: Dimming performance can be highly dependant on the type of dimmer, the number of lights in the circuit and other factors. Results in your house might vary. Mouse over the graph for more details. Position 10 = Not dimmed. Position 1 = Fully dimmed.



Distribution Graph

Angle: 70° (±35° 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: 24%, Index: 0.068 (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]


LEDs in this Series

Name Price Watts Lumens Efficiency Color Angle Fitting
9W CW COB LED Downlight $24 (AUD) 8.7W 641lm 82lm/W Cool White, 6092K 70° Kit
9W WW COB LED Downlight $24 (AUD) 8.9W 457lm 80lm/W Warm White, 3099K 74° Kit


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.