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Welcome aboard scapepro,
To answer your question, yeah you do need to be aware of the whole electrical arrangement when changes out to higher watt bulbs. All transformers should have on them a max wattage rating - all you do is add up all the bulbs in the lights that the transformer feeds, and it should be less than that rating. If it's more, you'll probably know it before you add the numbers - only a few, or possibly none of the lights will light, because they'll be trying to pull more juice than the transformer will allow.
You also have to be careful not to load up the lighting with a monster trnasformer capable of supplying way more juice than you need - this can quickly lead to fried out wires/lights, and could result in a fire. your best bet is to install a transformer that has just a bit more juice than the total requirement of the lights.
I hope this helps.
Jeff
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