Running small (2.5v) light bulbs through arduino?

i'm trying build looks little older, using leds doesn't work well, , figured low voltage light bulbs work great. grabbed 2.5v bulbs , little mounts them. lighting them 2.5-5v worked great (a bit bright @ 5v, understandable).

my problem getting them light arduino (uno, if matters). have basic sketch (starting "blink" example in core example set) , doesn't light up. put in led , lights great. put bulb either 3.3v or 5v pin directly , bulb comes up, not @ of regular pins (i've tried both pwm , regular pins,with both analogwrite , digitalwrite).

any thoughts? assume i'm missing simple-but-clever piece this, it's eluding me , there isn't on driving small light bulbs searching i've done (or volume on leds , driving full size light bulbs has buried it).

thanks!

bulbs need more current i/o pin can provide
you need transistor, google "arduino lamp transistor" or "arduino bulb transistor" examples

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