Review and teardown of an V-TAC LED Bulb model: VT-1864

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martosound
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Review and teardown of an V-TAC LED Bulb model: VT-1864

Hi, everybody!

I’m from Bulgaria. There is an V-TAC LED bulb brand on the market. I have bought several LED bulbs before two years. The price then was 6 EUR for VT-1864 model.

Parameters of the bulb are:

100-240V, 50/60Hz, E27, 12W, 1055Lm, 4500K, 200°, 72mA

The weight of the bulb is 160 grams.

I have measured parameters below with a PEREL E305EM5 Energy Meter

Cold Bulb 231 V 0.06 A 11.6 W cos θ=0.84
After 1 hour of work 233 V 0.06 A 10.7 W cos θ=0.76

I have measured the flicker of the bulb with a TEMD5510FX01 photodiode and Philips Oscilloscope PM3215.
Percent Flicker = 50% – quite a few.

The illumination, which I have measured by MASTECH MS6610 lux meter with a distance of 2 meters from the bulb is 100 lux.

The light is neutral white, corresponds to 75 watts incandescent bulb and the room is illuminated well..

I have measured the temperatures of the LED’s Solder-Point Temperature and bulb housing with a thermocouple K type.

Ambient Temperature – (Ta) = 17°C
Solder-Point Temperature – (Tsp)
Temperature of the Housing of the Bulb – (Th)

Work Time 15 min. 30 min. 1 hour 2 hours 3 hours 5 hours
Tsp 63°C 76°C 83°C 85°C 86°C 88°C
Th 43°C 55°C 62°C 64°C 66°C 68°C
Ta 17°C 17°C 18°C 19°C 20°C 20°C

There are 27 LEDs type 2835 on the Metal Core PCB. Every LED is made from 2 chips serially connected. The LEDs are connected in three parallel groups. Each group consists of 9 LEDs connected in series. Voltage is 54.5 V , Current is 187 mA in cold LEDs.

This is the aluminium housing covered with ThermoPlastic.

Bulb’s socket – E27 EDISON Screw.

Plastic cap on the bulb.

Top of the LED Driver. Two electrolytic capacitors are 105°C, Low ESR.

Bottom of the LED Driver. The IC on the PCB is BP2325А. The BP2325A is a high precision non-isolated buck driver with active PFC, specially designed for universal input offline constant current LED lighting.

Conclusion:
The bulbs work well for two years without any defects and problems. Heating of LEDs is within limits. No reduction of the power of light. I think this is a good and usable bulb.

Edited by: sb56637 on 09/02/2017 - 12:43
djozz
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Thanks for the informative review martosound, I do not know the brand but I appreciate household bulb reviews on BLF very much.

Mitko
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Quote:
Thanks for the informative review martosound, I do not know the brand but I appreciate household bulb reviews on BLF very much.

You`d better dont know it, i presume its a product advertise

As an engineer is a construction company i tried working with those/them, here is the E14 example of theirs

Thats just after 20mins of work in open air

And ofc they are duying like rabbits, we do actualy used those in a church that we were reconstructing, in first 6 moths we had above 50% death rate…i alarmed their head office about that issue, yet the problem stayed till we swapped them with Osrams

Their Ra and especialy R9 is awful too

Avoid that brand at any cost…at least for now till they learn how to do things right

mstar19
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Best LED lighting is manufactured by Titan LED in the USA. No one can compete with the quality.

djozz
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mstar19 wrote:
Best LED lighting is manufactured by Titan LED in the USA. No one can compete with the quality.

Oh yeah Party
raccoon city
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I've never even heard of Titan LED!  :FACEPALM:

mstar19
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In the LED world, Titan versus the competition is like the difference of a 720 TV versus a 4K TV. No one can compare to Titan. If in Minnesota, call me at (612) 578-2352!

light-wolff
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mstar19 wrote:
…, Titan versus the competition is like … 720 TV versus a 4K TV….

So Titan is 720 and the competition is 4K?
BlueSwordM
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No, the opposite.

Titan is 1440p, and the competition is 720p/1080p/1440p/2160p.

Titan LED is like Lumenpulse, but with usually lower warranties and less high CRI options, along with less… overkill heatsinking options.

And like Lumenpulse, unless you have deep pockets, or are a company, steer away from them.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547