The heatsink on these bulbs are not really meant for anything bigger than 3x1W and is too inefficient for it IMO.
If you plan on running it 5+ hours I'd try to add some cooling or you may end up with some burnt out bulbs. Running a 3W for over 5 hour is hot to the touch.
If you plan on running it 5+ hours I'd try to add some cooling or you may end up with some burnt out bulbs. Running a 3W for over 5 hour is hot to the touch.