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 |
| Rating |   |
|---|
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 |
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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
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
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.