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The IOP series are a "programmed start" ballast type. Unlike the ubiquitous "instant start" variety, these ballasts pre-heat the delicate filaments in the bulb before starting the high voltage. The advantage is that the bulb filaments almost never burnout, especially when the light is switched on/off very frequently. The only (small) downside is that there is about a 1 second delay (for the filament to preheat) before the lamp lights. I have used IOP's throughout my home for 8 years now, and have had only one or two lamps (out of about 20) fail in all those years!
Verified purchase: Yes | Condition: Pre-owned
good quality
Verified purchase: Yes | Condition: New
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