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Rain_Frog said:
I have been told its from too much light and too much heat, but my friend from work (who is the florist manager) could be wrong.
I would go so far as to say that it is never too much light. It is too much HEAT from the lights. I don't care how many CF bulbs you pack under the hood, you aren't going to generated enough PAR to photoinhibit most bromeliads. However, the heat from the lights will scorch the leaves. I have yet to see a case where cooling down the temps at the leaf surface did not stop leaf scorching WITHOUT reducing the amount of light. Just remember, more light usually means more heat. Heat dries and scorches the leaves. And there is more than one way to reduce the heat and maintain humidity around the leaves - reducing the amount of light being only one of them.

I'm also a little surprised at how often I hear that broms are slow growers. This might be true for many broms but I've found several of the Neo. and Vriesea sp. commonly grown in vivs to be pretty much weeds and often a little annoying at how fast they pup and need to be trimmed back. I've found if you give them a lot of light, keep them cool (below 90F) and keep them humid, they tend to go nuts.
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