Installing higher wattage lights...

[mark]

Might be a lot of effort and after reading Anthony's post, wondering if was necessary, but when I picked up a clam and frogspawn that was kept under 2x150W for years and placed in my tank (2x250W) placed piece of light diffuser (eggcrating) on top of the tank and over the new additions. On the diffuser did something like 15 panels of window screen and removed one every day or two.

[MikeP]

So the lights have been going for about 6 hours now. They are 250w SE 20K bulbs. One is noticeably bluer than the other. Is one of them defective? Or will they end up matching after a while?

[fkshiu]

MH bulbs often take a while to "burn in" so I'd wait a week or so before declaring them defective.

Another method of easing light stress is to place a couple layers of window screen mesh material on top of eggcrate. I started with two layers and removed one each week and waited another week to remove the eggcrate when I went from 175W to 250W MH.

[MikeP]

Originally Posted by fkshiu

MH bulbs often take a while to "burn in" so I'd wait a week or so before declaring them defective.

Another method of easing light stress is to place a couple layers of window screen mesh material on top of eggcrate. I started with two layers and removed one each week and waited another week to remove the eggcrate when I went from 175W to 250W MH.

Thanks.