will my house burn down?

I have one of these desktop lamps from Home Depot that has a
transformer and a 20w incandescent bulb in it. I put a 4004 diode in
series with bulb to calm down the light. The intensity is very nice
now but the base which contains the transformer seems to be a bit
warm. Is there a reason the transformer should run warm because I am
pulling current from the transformer in only one direction? It's been
running for 2 days down on my workbench and hasn't set the place on
fire so I assume it's probably ok.

regards,
NEO
.

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