Did not think to try powering up, told broken.
11W large LED omniderectional room light, Medion Lifelight, 1055 lumen.
Easy enough to break into, the globe opalate glass is just for
diffussion, no vac inside.
Tried powering up the LED disc with 60V bench ps and no light.
Uses BP2812, max 135mA drive from the datasheet and application much as
in the datasheet,also 22R 1W in the supply line. 36 LEDs so probably 1
string and a chain is only as strong as its weakest link. So supply
probably 120V at 100mA and 60V would not have lit a working one anyway.
First tried a fairly isolated LED, preheating the Al heatsink disk then
freezer spray , then more hot air and tugging on the LED just broke it
up. At least it showed which end was the heatsink terminal pair plus
underlying pad.
Cathode end is chamfered corner and feint dot under the optical surface
on these SMD LEDs. Heatsink pad to anode.
So tried a single edged old type razor blade. With shearing and slight
saw action cut under the LED anode end first, angled down into the disk
layup and when just sheared , finger over the body of the LED to hold
down while shearing the cathode end pair of pads. Insulator plus traces
layup shears from the Al disc, leaving quite clean reusable LEDs. They
all tested working order except the first obviously, another one that I
forgot to hold a finger to and it split in the middle and one that
looked fine, presumably the original failed one.
Much more interesting , and other useful stuff , inside these new
fangled lamps , including CFL, 400V 125 deg C caps, diacs etc than old
boring filament lamps

N_Cook kom med følgende:

Much more interesting , and other useful stuff , inside these new fangled
lamps , including CFL, 400V 125 deg C caps, diacs etc than old boring
filament lamps

As a kid, I unrolled capasitors from junked tube radio/tv's to find
something interesting inside. But after I removed all the wrapping,
there was nothing. Very disappointing...

Leif

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