4W LED bulb GU10 Review

General Information

ID #248
Manufacturer IKEA (other LEDs from IKEA)
Fitting Type GU10 (other GU10 LEDs)
Light Type Downlight (PAR)
Height 54mm
Diameter PAR16 (50mm)
Weight 45g
Warranty N/A
Test Date 2014-02-06
Review Notes IKEA explicitly excludes light bulbs from it's limited warranty cover in the USA, so zero warranty for US purchases. In Australia guarantees cannot be excluded under the Australian Consumer Law but the duration is not stated. Product package carries C-Tick and CE approval labels. Light has quite a good CRI for it's price. Globe is not dimmable and not bright enough to be considered as a 50W halogen replacement. Heat sink does a poor job of distributing heat from LED chip. Ikea have been very honest with the specifications. It is unusual to have our measurements exceed a vendors claims.
Price $6.99 (AUD) from IKEA on 4th of February 2014


LED Specifications

Claimed Measured Compared To
Watts 4W 3.9W @ 242V 50.2W @ 242V
Yearly Running Cost[?] $0.88 $0.85 $10.99
Lumens 200 lm 216 lm 498 lm
Efficiency[?] 50 lm/W 55 lm/W 10 lm/W
Lumens/Purchase Price 29 lm/$ 31 lm/$ 144 lm/$
Power Factor[?] N/A 0.58 1
Color [?] Warm White, 2700K Warm White, 2833K Warm White, 2737K
Angle[?] 36° 34° 33°
Dimmable Not Dimmable N/A Yes, Leading or Trailing Edge
CRI (Color Accuracy)[?] 80 84
Life 25,000 hours Not Measured 2,000 hours
Min/Max Voltage 220V / 240V 220V / 240V
Min/Max Temperature N/A / N/A N/A
Measured Temperature 66°C @ 25°C ambient
151°F @ 77°F ambient
192°C @ 25°C ambient
378°F @ 77°F ambient
Flicker Percent[?] 2% 9%
Flicker Index[?] 0.004 0.029


Link to manufacturer specifications at time of testing



Distribution Graph

Angle: 34° (±17° 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: 0.004 (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
10W LED Bulb E27 Clear $10 (AUD) 9.4W 530lm 60lm/W Warm White, 2673K 241° E27
11W LED Bulb E27 $10 (AUD) 10.8W 611lm 55lm/W Warm White, 2713K 250° E27
3.8W LED bulb GU 5.3 MR16 $9 (AUD) 4.7W 236lm 53lm/W Warm White, 2650K 31° MR16
4W LED bulb GU10 $7 (AUD) 3.9W 216lm 50lm/W Warm White, 2833K 34° GU10


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.