I have the Dinotte 300R and my husband has the Lupine Rotlicht. There really is no comparison – the 300R is WAY brighter. The Rotlicht is fine for nighttime riding, but only marginally bright enough for daytime riding. The other advantage of the 300R is the battery life; on strobe, it goes on forever. I get over 10 hours on a charge and my light is at least four years old. The advantage of the Rotlicht is that it’s much lighter and more adaptable to a variety of seatposts.
Now you’ve made me go to the Dinotte website and see that I can get a great price on the Quad Red with a trade-in on my 300R. Sigh. Always more money to spend.