I am interested and I want to buy the woodpecker dte o-star, but to be sure of the purchase, I would like to know for how long can it maintain the 3,000mw/cm2 stable? considering ortho mode works 5 or 10 times in a row. Also, does the power remain constant at all times, regardless of the battery charge level? I ask both questions because cordless curing lights tend to decrease their maximum power after continuous use and/or when the battery level approaches minimum. finally, do you have the comparison studies with the valo and ivoclar powercure lamps? (Considering that in advertising they compare it with both brand) thank you