Ok, with IR bulbs you will get varying degrees of distance. Tamiyas is about 60 ft on average.
this is the best ir available. We call it the HEAT round. Its a spitzer shaped emitter and we can shoot so far you cannot tell you hit the other tank. Well beyond 200 ft.
if you have older Green ibu boards you will have to do a mod to the ir circuit as they have a 68 ohm resistor for henglong bulbs. What i have to do is cut the + lead off the plug for the IR, solder it to a 22 ohm 1/4 watt resistor and then solder to the power side of the on off switch. This process came from Ivano to bypass the low IR output designed for HL systems.
https://www.digikey.com/products/en?...ds=475-2919-nd