The last time I removed it (have removed it several times) I had to use a computer mouse mat like a jar remover like you see in a kitchen store, and at first you won't know that your turning it, it moves so imperceptibly at first
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I changed the LED With a SSC P4 Led for a friend with the Intova 3W, Ya, the final light become much brighter.
Curious .. Which P4 did you use? and what is the lumen rating at the 700ma that your likely getting from the Intova driver?