Over the festive period i have fitted a set of Ikea 'string' lights as effect lighting at home. They are powered by a transformer to reduce the voltage to the light fittings to 12v and came with 5no. 20W MR16 lamps. I'm thinking of replacing the bulbs with low energy bulbs or even LED lamps as they are currently a bit too bright and i figure i may as well reduce the energy they use. However, my question is, if they are powered by a transformer, is it the transformer that consumes the power and therefore it wont make any difference what wattage or type the bulbs are, it will still consume the same amount or power?