[Astro_Bot]

I have that exact one and have used it several times to collimate an SCT. It works fine, even using the dimmest LED. I did make up a better magnetic mask from an old fridge magnet as the supplied one, while OK, was fiddly to adjust and would fall off if touched.

Assuming it's used at night, I can't imagine requiring anything brighter. I use mine at a range of 22m indoors, even with a couple of lounge lamps still on (but not anywhere near the field of view). Outside, I'd imagine it'd be good at >100m using the brightest LED.

Leaving a dim lamp on can be helpful as it gives some "artificial skyglow" that outlines the field of view and makes centring the diffraction rings easier.

I've checked collimation results outside with Sirius and found the collimation I did to be spot on.

Edit: I keep saying "brightest LED" or "dimmest LED" but, actually, all the LEDs are the same and it's the size of the hole that changes, thus letting through more (or less) light.