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I can't answer that question directly but I can say that it was a total disappointment! I purchased one thinking it would help right at those first & last light situations but it doesn't! It has to be pretty well black dark before you see the reticle which of course is after legal shooting time!!
DONT use the flaslight that comes with it. it's a POS and doesn't work well. go out and buy a super bright mini light or something and use that. it'll work much better.
So if you light it up 90min before dark will it still be glowing at the end of shooting light? Can't imagine fumbling around with a flashlight in a treestand during prime time.....