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This is not the case. Search on net, this leds are complex and are driven by Vf 20V each.For example:http://runlite.gmc.globalmarket.com/products/details/led-high-voltage-5730-five-chips-led-diode-1829171.htmlOr http://www.ledsmagazine.com/articles/print/volume-8/issue-4/features/high-voltage-leds-offer-optimum-solution-for-indoor-retrofit-lamps-magazine.html

Hi, thanks for replaying. Ok. Just opened working one, dc voltage is 190V ! So this are not ordinery leds, there are 10 leds, so voltage across each is 19V, never heard of these. This high forward voltage probably is reason why my multimeter can't check these ...PS.Just searched net, there are some sort of led series arays with 20V DC firward voltage...

Hi, thanks for replaying. Ok. Just opened working one, dc voltage is 190V ! So this are not ordinery leds, there are 19 leds, so voltage across each is 19V, never heard of these. This high forward voltage probably is reason why my multimeter can't check these ...

Testing with meter shows that cicruit is whole, led are measured as break in both directions... When desoldering led board from supply board (+&- points), two of the leds were blinking wery fainted. Supply board shows output 400 VDC and around 30VAC but ac value is varying from 11 up to 70VAC...

Great tutorial, thanks. Driled 2mm glass without problem. Used dremel, round bit with diamond coat and glass was covered with thin layer of water, abou 1cm. It took some time, but did not cracked.