I had an interesting experiment with LED christmas lights last year. I found the string of LED lights too bright on the tree, so I tried them on a dimmer. They would not light at all. strangely when I plugged in an incandesent string, both strings worked and dimmed perfectly.
My final set up was two 9 watt LED strings and one 4 watt incandesent night light all dimmed ~50%. So much better than the two or three 27 watt strings from years earlier.
By the way, I made the dimmer test strip from a cheap power strip that I spliced a wall dimmer into the cord. Now I can add a dimmer to any wall outlet for testing through out the year and for lighting the tree at christmas.
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