i've upgraded from 2X150W to 1X250W(spider reflector) + 2X39W HO t5...or should i say downgrade...hehehe
using hamilton 14k bulb tat i got from deepblue...although a lot of pple say that 250W is extremely hot, i dun feel so...i feel that the heat generated from my 2X150W was even worse...i can maintain my temperature below 29C with only 2Xprofantic fan...when my MH are on,my tank temperature will not increase significantly, perhaps around 0.5C only...without MH on, my temperature is always below 28C...
when i was using the 2X150W, my tank temperature shoots up to JUST below 29C...sometimes even above 29C...but not now...
although i feel(comparison with my bare eyes) that the 14kk bulb is not as bright as 10kk bulbs, my corals(prata brain) at the bottom of my tank (2FT tall) seems to enjoy it better...but i also noticed that my clams are not growing as fast, which i prefer cos i dun want them to suck up my calcium...
with 10kk bulbs my tank look mainly BROWN and very very boring...but with the 14kk bulb, all my corals ignite with florescent(excuse my spelling) GREEN and shocking PINK...
i'm glad that i didn't get a 10kk bulb, and i will stick to 14kk from now on...