I have the light installed on the handle of a Primo XL Oval Ceramic grill. This product provides an ample amount of light for this grill.
C-clamp could be a bit more stiff. If the manufacturer would have molded in some small gussets inside the corners, I think it would improve the strength. It spreads open when clamped and if overtightened, it may actually break. Fortunately it clamps with enough power to hold it in place without too much stress on the "C".
The only problem that I could foresee if is the lid was left open with a really hot fire, it could damage the light because the light is just about centered over the fire when the grill is opened. Of course since we don't cook with the lid open in the ceramic world, I think it will be OK. It is worth mentioning that the instructions DO say not to install directly above fire. But to me, since it is designed to be installed on a grill handle, I don't see how that can be avoided on most any grill which it would be installed.
The instructions do say that extreme weather conditions may damage the unit and they recommend storing inside when not in use. Even so, I would like to see a gasket on the battery cover as it is not uncommon for me to cook while it is raining. I don't know if water will get in, but just to be safe, I think I will put some silicone on it just to be safe. I don't know if the switch is sealed though.