All LEDs produce heat, it's why virtually every LED light you see has a heatsink with fins to help shed that heat to the atmosphere. How big of a heatsink you need is dependent on the application you're using the light in. For example, work lights for a garage need large heatsinks because they have to stay cool indoors where there's no airflow to help pull the heat out of them. Our lights are optimized for use on the bike, where you're moving and thus have a ton of convective airflow to pull heat out, and thus can use a much smaller, lighter weight, sleeker heatsink. Even at slow climbing speeds, our lights will stay plenty cool enough.
If, however, you're turning the bike lights on and letting them sit still with no airflow, yeah, they'll get hot. We have thermal monitoring built into every light that allows them to get hot, but not so hot they could ever burn or injure human hands. In extreme environmental cases, the light will pull power back to reach thermal equilibrium, and if it can't for any reason, it will shut the light down entirely for safety, but unless you're really trying to make the lights overheat, you'll likely never see any power reduction, much less shutdown, in normal use.
TLDR: yes the lights can get hot, but they're safe, and it's nothing to worry about.