I know at least one RX3 owner has expressed concern regarding the extra heat generated by the 55W/60 H4 bulb. So far I haven't noticed any problems using the hotter, brighter bulb. However, if one is concerned the extra heat might damage the plastic reflector, he can always drill a few well-placed ventilation holes in the back of the headlight.
The headlights of all my other motorcycles are completely open in the back. Also, as you can see in the photograph, nothing inside the RX3 headlight will be damaged by a little dirt or moisture.
__________________
Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894