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        Q: Transformer for my LED christmas lights?
A: It depending on the resistance of the transformer , but I would n't recommend it unless you are aware what the transformer resistance is . I would also to worry about about the reverse voltage on the LED . 

Q: Would using LED Christmas lights in my room be cheaper than just turning on the lights?
A: You can wire as numerous as you want in one string , but you will be required to do the math to make persuaded that you give them just sufficiently juice , and it changes if you put in more LEDs . Too much juice , and they burn out like any ordinary lighting bulb .   And I 'd schoosing to do a parallel circuit instead . If one does n't work , solely that one failed , However , your idea , called a series circuit , will fail altogether if only one broken . 

Q: Is it safe to use Christmas lights as a bed decoration to give off the fairy light effect?
A: All of them , but how close it 's safe to put them to combustible surfacing depending on the bulb wattage . But remember , any indoor lights were made to sit next to Christmas tree needles that 's a very combustible , so unless you cover them with paper or plastic these people are n't likely to set fire to anything . Exterior lights might get a bit too hot , but solely if these people are incandescent bulbs . If the lights are LED bulbs as so numerous are these days , they never get hot sufficiently to even feel warm to the touching if you close your hand approximately them .