I used a red bulb when mine were babies. I have actually
read that this color is much better than others as it doesn't
seem to disturb the turtles sleep. If you are still concerned
you can buy a ceramic spotlight that puts out only heat but
these are expensive and soon you probably won't need it.

As far as lighting, as long as you have a UVB source, (I
have always used the Reptisun 5.0 and I have kept turtles
for 9 years now) you can use a regular old household bulb
for heat. Just make sure that you use the appropriate wattage
to keep the basking area 85-90 degrees. Also, always use
a fixture that is ceramic and never plastic (where you screw
the bulb in). I learned the hard way but at least there were
no injuries or fire.