Are there any other so called "PR drop in LEDs" other than the nite-ize PR LED that's made for D cell lights and is sold at Walmart for about $10 (which is a bit much, I think). I was curious as to whether there are ones that are luxeon or even Cree. One of these would be great for converting an incan light to LED without settling for a dim light like the nite-ize one referred to above puts out.