The lamp shown in the Opti add is not an LED. It looks pretty much the same as the lamp in my 8-year-old Steripen Adventurer. I'm not sure whether it is a Mercury vapor lamp or not but it is a doubled-over small-bore fluorescent tube. It produces a purplish visible (in low light) glow when working. There is also an LED indicator light on the side of the unit to indicate whether it is operating properly.
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May I walk in beauty.