4W LED Filament Classic Review

General Information

ID #327
SKU 1000617 GLS - 9348641000654
Series N/A
Manufacturer Mirabella (other LEDs from Mirabella)
Fitting Type B22 (other B22 LEDs)
Light Type Globe
Height 115mm
Width 60mm
Weight 36g
Warranty 1 Years
Test Date 2015-01-02
Review Notes Only the second filament LED bulb we have tested. The other one being the LEDisong. Excellent efficiency. Recommended by the manufacturer as a replacement for 25W incandescent bulbs, but it performs nearly as good as a 40W globe. Like many non frosted globes the output is a bit lopsided, with very little light output directly under the globe. No flicker, which is nice, but no dimming and only a 1 year warranty. Carries RCM approval marking. Maybe ominously, the manufacturer makes no claims as to the expected lifetime. We are making a pessimistic guess of 5000 hours.
Price $20 (AUD) from Coles on 4th of January 2015


LED Specifications

Claimed Measured Compared To
Watts 4W 3.9W @ 241V 64.7W @ 246V
Yearly Running Cost[?] $0.88 $0.85 $14.17
Lumens 420 lm 417 lm 811 lm
Efficiency[?] 105 lm/W 107 lm/W 13 lm/W
Lumens/Purchase Price 21 lm/$ 21 lm/$ 406 lm/$
Power Factor[?] N/A 0.55 1
Color [?] Warm White, 2700K Warm White, 2854K Warm White, 2711K
Angle[?] Omni-Directional 286° Omni-Directional
Dimmable Not Dimmable N/A Yes, Trailing Edge
CRI (Color Accuracy)[?] N/A 82
Life 5,000 hours Not Measured 1,000 hours
Min/Max Voltage N/A / 240V 240V / 240V
Min/Max Temperature N/A / N/A N/A
Measured Temperature 43°C @ 25°C ambient
109°F @ 77°F ambient
158°C @ 25°C ambient
316°F @ 77°F ambient
Flicker Percent[?] 1% 11%
Flicker Index[?] 0.002 0.034


Link to manufacturer specifications at time of testing



Distribution Graph

Angle: 286° (±143° 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: 1%, Index: 0.002 (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.