This is a review of the Phillips Advance Optanium IOPA-4P32-SC which I don't find on the website. Sold in the store for $14.97 each or in 4-packs at $54.96--either joyously undercuts the item above. A commercially rated ballast for up to four 48" T8 lamps. Voltages from 120 to 277. Minimum start temperature, 0 degrees F. The ballast this replaced was the Advance REL-2P32-SC (no longer made), which, while also an electronic ballast, had a tendency to hum/buzz audibly.The Optanium is instant start and quiet--I cannot hear any hum/buzz.
I retrofitted six fixtures and have six more to retrofit. The hum/buzz from one tube bothers me. The hum from 24 tubes drove me out of the house, so I never turned them on.
Installing: Don't let all the wires intimidate you. Turn off the power, get a flashlight/work light. Remove the old ballast(s)--if it's the original that came with the fixture, cut the wires where they come out of the old ballast and let them dangle straight down. When you've done that, you can sort them out. Bolt in the new ballast, connect the black & white wires of the new ballast to the Black/white wires coming in from the power source. Now follow the wiring diagram on the label of the new ballast. insert tubes to test your work. turn on the power & then the lights. If they all light, turn off the power, remove tubes & close the lamp case, put the tubes back in & move on to the next project. If they don't light, power off & check your wiring. Lather, rinse, repeat.