3.5W LED Filament COB Bulb Small Review

General Information

ID #332
SKU G55-3.5BC25F
Series 3.5W LED Filament COB
Manufacturer littil (other LEDs from littil)
Fitting Type B22 (other B22 LEDs)
Light Type Globe
Height 126mm
Width 55mm
Weight 41g
Warranty 2 Years
Test Date 2015-01-12
Review Notes A nice looking very low wattage filament LED globe. While efficient, it unfortunately it isn't that bright. About the same as a 25W traditional globe. Vendors claims it is a, "direct replacement for energy consuming 60 watt traditional incandescent globes". Which is a gross exaggeration. Flicker graph is a bit nasty looking. This might be a result of squeezing the electronics into the cap of the bulb. Vendor claims the colour temperature is a very warm 2500K. But it isn't nearly as warm as claimed. List price according to littil's recommended retail price per unit. The glue failed during testing and the metal cap came loose from the glass. Another bulb shape is also available.
Price $24.95 (AUD) on 11th of January 2015


LED Specifications

Claimed Measured Compared To
Watts 3.5W 3.3W @ 241V 64.7W @ 246V
Yearly Running Cost[?] $0.77 $0.72 $14.17
Lumens 320 lm 293 lm 811 lm
Efficiency[?] 91 lm/W 89 lm/W 13 lm/W
Lumens/Purchase Price 13 lm/$ 12 lm/$ 406 lm/$
Power Factor[?] N/A 0.93 1
Color [?] Warm White, 2500K Warm White, 2752K Warm White, 2711K
Angle[?] Omni-Directional 285° Omni-Directional
Dimmable Not Dimmable N/A Yes, Trailing Edge
CRI (Color Accuracy)[?] 83 80
Life N/A Not Measured 1,000 hours
Min/Max Voltage N/A / 240V 240V / 240V
Min/Max Temperature N/A / N/A N/A
Measured Temperature 42°C @ 25°C ambient
108°F @ 77°F ambient
158°C @ 25°C ambient
316°F @ 77°F ambient
Flicker Percent[?] 77% 11%
Flicker Index[?] 0.215 0.034



Distribution Graph

Angle: 285° (±142.5° 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: 77%, Index: 0.215 (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
3.5W LED Filament COB Bulb Large Round $25 (AUD) 3.2W 247lm 91lm/W Warm White, 2870K 295° B22
3.5W LED Filament COB Bulb Small $25 (AUD) 3.3W 293lm 91lm/W Warm White, 2752K 285° B22


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.