Hi I can't do a comparison of the impact and tec 40 for you however, I can do a comparison of the pt rage(the 4AAA version of the tec40) and the attitude, and the brinkman longlife. In any case comparing incandescent with leds is a difficult thing. Each light has its own purpose. You have to consider what you will use the light for. Sure the Impact may be magnified but, because it is only one led at I believe 80,000 mcd's you may not get the brightness you desire. If you need to illuminate things at a distance you should just get the tec-40. I believe the led will be too dim for you.(depending on what you are using it for) However, it will not hurt to have a led light to compliment it. When I go nightfishing, we go to this dock area that is extremely dark. I bring my lightwave-3000, 4d maglight, rage and an attitude. But, I just purchased a surge so it will be taking the place of the maglight. In any case I find my self using the attitude or lw-3000 for close tasks light tying the line to the hook or just walking around the dock area. But, when things like the water have to be illuminated I use the rage or the mag. The leds just phase out. The brinkman longlife, which I believe may have a similar but weaker beam than the impact isn't even worth using. I feel you will greatly benefit from carrying an incandescent for the range and a attitude or other small led for close tasks and for lengthy durations. I don't feel the impact will be adequate for your needs. Then again I'm not sure what you will be using the two lights for. Sorry for the lack of organization and paragraphs, it's 1am here and I'm about to sleep. Hope this helped.