I have recently installed a single phase 100A service at a bus stop for a real time sign that includes lighting. Inside the sign there is a modem, PC board, thermostatic sensor and LED sign board. Attached to the same circuit, 20A single phase, are 6 T-8 fluorescent bulbs. I am concerned that the ballast, electronic, and its harmonic effects, will shorten the life span of the sensitive electronics inside. Are the effects of harmonic nonlinear loads alot of hullabaloo, or am I right to be concerned?