I have one M600DF, 3 HLX, and a self potted Solarforce L2p, retrofitted to a SF SR tape switch.
I have no experience with Modlight, or Cloud Defensive. But I am very interested in a Modlight head for my DF.
I also think Rein looks very interesting.
Out of what I have experienced, you just can’t beat an HLX, for the price! It is an excellent weapon light, probably the best, budget option.
I have had a lot of dimming issues with the DF, unless I use the tail cap switch. I have fixed the flickering problem, using an SR switch, but it still isn’t as bright, as using the tail cap.
I’m kind of dissatisfied with the fact that a $150 SR switch, is incapable of supply the needed current to fully power the light.
I am also disappointed that the DF doesn’t preform as well as a HLX that is half the price.
This is why I have 3 HLXs.