Inside low-cost LED ac bulbs

Dave_H

Flashlight Enthusiast
Joined
Nov 3, 2009
Messages
1,216
Location
Ottawa Ont. Canada
Here are a couple of Home Essentials (from Home Hardware) A19 5000K LED bulbs, 40W (6W) and 60W (9W) equivalent, non-dimmable, 10k hour life. Regular price on these is $2.50-$3.00 each, in 2-packs. Some design similarity, but different enough, 60W is not directly scaled-up from 40W.

40W (top) uses 8 LEDs, having 6 LEDs per package (17.4v). Controller is Chiplight ICL1103 in 3-pin tab package, LED current approx. 30mA. Filter capacitor is 6.8uF which in my crude estimate allows approaching 30v ripple on the rectified dc. How much this impacts light quality is not clear.

60W (bottom) uses 15 LEDs, having 3 LEDs per package (8.6v). Controller is ICL1102 in 8-pin SOIC set to 44mA current. Capacitor is 15uF, ripple estimated roughly 20v.


Dave

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Dave_H

Flashlight Enthusiast
Joined
Nov 3, 2009
Messages
1,216
Location
Ottawa Ont. Canada
Ikea in Canada has dropped cost of 40W eq. 2-pack from $1.99 to $1.79 (-10%). In times of inflation I wonder how they manage that.

I think the Ikea bulb uses switching design to allow for easy adaptation to either 110v or 220v markets. The LED drive voltage (around 80vdc) and LED array can stay the same. The input needs to be a bit different i.e. higher voltage rating on capacitor(s) and other minor changes.

Anyway, I picked up some 100W eq. (14W) A19 5000K bulbs from Giant Tiger ("Giant Value"), $2 each in 4-pack. Package says 1300 lumens (not great) but bulbs themselves are marked 1500 Lumens (better). No surprises inside, two linear regulators SM2082EGS in parallel.

Dave
 
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