Whelen Strobe Power Supply The A490TCF series operates one strobe lighthead. It is Whelen's most compact unit and can be mounted in the wingtip and​/​or the tail adjacent to the lighthead. It produces an accumulated 19 joules of power. It will only meet 400 CP when used with the A470A-W. This unit cannot be synchronized. This power supply operates from 10 to 30 VDC (not approved for use with Red strobe light).