Bought some new coils for my Arctic and they have changed . The old ones were BTDC bottom turbo dual coils 30 to 80 watts . The new ones are BTDC 11 and are 40 to 80 watts . These are the 0.5 ohm coils. Anyway my defender 36 watt is a little under powered for the new ones. The airflow is even airier than the old ones . Anybody else seen these or noticed.