I've made a couple before. They are very light, probably even lighter than bone. But they can also be very sharp. I'd say you could probably treat heated treated boo like bone as far as arrow head profile and mounting and such. Generally try to use larger diameter bamboo because it will be thicker.
We've had a missionary at our church from papua new guinea and he had some arrows. One of which had a bamboo head which was very long (at least 5") and had a semi-circle profile. It was designed to act as a blood groove when they would hunt monkeys, It could also hold poison. pretty cool stuff.