>> Cia is serijos jei LED efektyvumas 50%, tai 6W silumos + 6W sviesos? :))

> https://www.led-heatsink.com/thermal-calculation
> http://www.cree.com/led-components/media/documents/XLampThermalManagement.pdf

Cree royal blue XLamp LEDs are over 50%
efficient and white XLamp LEDs are over 40% efficient. That is, under 
normal operating conditions, approximately 50% to 60% of the input
power is output as heat, while the rest of the input power is converted 
to light. To be conservative, assume LEDs convert 25% of the input
power to light and output 75% of the input power as heat.

Tai Henskes elektronikos efektyvumas iki LED'uku sakykim 90%
Eda 12W = 1,2W elektronikos nuostoliai, o 10,8W ateina iki LED'u.
Apsimeskim, kad ten  ~50% efektyvumo ledai,
tai 4,9W silumos + 4,9W sviesos.

Viso 12W = 1,2W+5,4W silumos lemputeje ir 5,4W sviesos
(kuri paskui apsvietusi grindis pavirsta i siluma ar ne?
Silumos kiekis - 6,6W lemputeje, 5,4W ant grindu = viso 12W.

Ar kazkurie teiginiai yra nesamones? fizikas as slabnas.