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I’m using this all-in-one system that I purchased from Lee Valley. It has two tiers with built in LEDs; 2 x 24” tubes above each tier with a built in reflector. They look just like T5’s but they are actually LEDs. I imagine I can replace them with any LED that is a T5 conversion bulb. Going to checkout the sunblaster ones!

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Originally Posted by MJG (Post 924853)

For my purposes over the long run, it's the empirical data that's going to matter. I'm going to be hanging these lights over a 36" deep terrarium. I will probably have to tweak as I go to get adequate light to the bottom without burning out the orchids at the top. But I will be interested in readings, as they will help my decision making.

G85, do you use reflectors? They can help. Also, I spent 3 solid days googling and reading different articles about lights before I bought the Sunblasters. There are some good technical write-ups out there about different bulbs if you're willing to wade through all the other stuff.