Well once again the urban legend of turning on the weather radar to scare away birds has been raised.......
No truth to this at all. The frequency of the transmission and the low power level make it undetectable by birds, but if it makes you feel good - turn on the radar.
As for pulse lights, the Canadian Transportation Development Centre (TDC) did a study back in the early 90's on this issue and found there was no measurable response by birds to lights being pulsed at them. They measured physiological functions and monitored for fear responses and nothing occurred. Based on this the TDC concluded that this technology was ineffective and stopped further research.
Pulse lights may offer benefits by increasing aircraft visibility, but only to other pilots!