I have a 4 bulb aquatic life withe the LEDs and programmable timer ont the fixture. I have noticed this for the past 2 bulb changes. I change them at 6 months . There is a acrylic cover over the bottom. But there are built in fans on the unit I believe. So a 24 inch bulb is like 20 inches with the burnt ends. Lol
Is this possible do to the ballasts? I am going to call the lfs where I got the fixture last July it's comming close to the 1 yr mfg warranty , so I guess I will have them check it out ... But it just seemed odd that this was happening, and didnt matter on what brand of bulb. Stock bulb, giessmann's, or ATI ....