help with lights

[reefnut]

can anyone tell me how long a 15 watt fluorescent bulb will last if i run 20 watts to it.will the spectrum rating stay true to the rating and will there be more heat?thanks for the info

[Skimmerking]

once you start OD bulbs the intensity will start to fade away faster. I would say around 4-6 months With that being said the hotter the bulbs the faster they will burn out.