ST... Dont' take what I said as a negative. They still catch fish... they just act a bit different than what we are used to.
I can't find the numbers but we put these light sticks on a meter and boy were they bright. The LP sticks topped out in the low 90's and the powder sticks topped out around the 140's I think. Both quickly dropped down after the inital burst. I may be off a little but I think those were the numbers. After 6 hours the LP's were still going but didn't compare to the powder sticks (once you shook them up again).
I think too that the Powder sticks are not UV sensitive. The LP sticks must be keep in a dark place as UV light and even Floresent light will kill the life span of them. So there's + and - to all these lights.
-Tek