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Tomtop E27 13W 263 LED 110V Corn Light Bulb Lamp White

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Features:
With 263 LEDs, it produces ultra bright white light.
Shaped like a corn, it has a full lighting angle of 360°.
Long service life, high luminous efficiency.
Energy saving and enviromental friendly.
Spotlight, no UV and IR radiation.
Designed to fit standard E27 fittings.
Low power consumption.
Does not contain lead, mercury and other pollution elements.
Suitable for halls, bars, office or home use.

Specifications:
Interface type: E27
Light color: White
Voltage: 110V
Consumption: 13W
LED quantity: 263 pieces
Lumen: 1050LM
Color temperature: 6500-7000K
Item size: 14.6 * 6.1cm (L*D)
Item weight: 141g
Package size: 15 * 7 * 7cm
Package weight: 178g

Package including:
1 * LED Corn Light Bulb Lamp


General

Brand
Tomtop

Specifications

Light Appearance
White

Quick Info


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  • Chuck D.
  • 12/14/2013 7:18:00 AM
  • Tech Level: High
  • Ownership: less than 1 day

3 out of 5 eggsI Count 264 LED Lamps

Pros: LED lighting has matured to the point where even that big-box store that everybody loves to hate has their own house brand, the prices are getting pretty reasonable, and the quality is improving.

Cons: No indication if this one is dimmable... probably not. That means they probably used a capacitor to drop the voltage, but again, no indication.

Other Thoughts: I was an early-adopter and had to re-lamp and completely redesign the driver circuit on 27 GU-10 style ceiling fixture and track lights (36 lamps in each) in my house. Typical white LED drive voltage is 3.2, so yes, they group them in series. Normal house current has a rectified voltage of about 155-165VDC and 44 LED lamps in series (6 groups) would have a forward voltage of about 141, but my guess is that they have 12 groups of 22 in series. Using a capacitor to lower the applied voltage is inexpensive and efficient, but since capacitors pass high frequencies, noise on the line, or harmonics caused by a dimmer, will actually raise the applied voltage. Note that that refers to a conventional dimmer. If you intend to use them for portable lighting, e.g. umbrella lamps for photo use, you can use a Variac, provided it has sufficient noise control. (Most do)

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  • Richard R.
  • 4/29/2013 7:08:21 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

3 out of 5 eggsToo Large

Pros: Does not get hot, so the LEDs should last longer. The large size make heat dissipation easy.

Cons: Same light at 60 - 70 watt bulb, I expected more.

Other Thoughts: The LEDs may be in a series configuration, This could be the same as the old Christmas tree lights.

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