I thought this was interesting.
"With up-to date LLC and synchronize rectify technology, HLG-240(H) posses up to 94% of high efficiency, so it can be cooled by free air convection from -30° to +70° ambient temperature and meets the requirements of outdoor assembly."
"These high efficiency power supplies are very suitable for LED street lighting, outdoor electric display, LED decorative lighting, indoor/outdoor LED lighting...etc. Besides, they are also good solutions for general applications at outdoor environment with high dust and moisture. "
Looks like you are going to have to try to keep the temp of whatever enclosure you put them into below 70 degrees for effective convection cooling.