If you put 40 leds in series, Theoretically, you don't need a transformer, but if one of them fails then the entire circuits fails and no more light is available, therefore, this configuration isn't practical. A transformer is needed, but the waste of energy of this device is low, now if you think that is low, but X 2 million... well light bulbs only convert 30% of the energy in light... sorry, but in the search for better technologies we must go step by step, and obviously this isn't the best way to achieve a 99.99% of eficiency. I think we go in the right way. (sorry for my english, I'm chilean)
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If you put 40 leds in series, Theoretically, you don't need a transformer, but if one of them fails then the entire circuits fails and no more light is available, therefore, this configuration isn't practical. A transformer is needed, but the waste of energy of this device is low, now if you think that is low, but X 2 million... well light bulbs only convert 30% of the energy in light... sorry, but in the search for better technologies we must go step by step, and obviously this isn't the best way to achieve a 99.99% of eficiency. I think we go in the right way. (sorry for my english, I'm chilean)