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Ask An Engineer: Relighting a Plant Nursery & Concerns About Striation
Wednesday, June 02, 2010

It's time for the next installment in our Best Of Ask An Engineer series, where we take some of our most insightful "Ask An Engineer" questions and post their answers where anyone can find them.


In this installment, we get information about unconditioned spaces, 25W lamps and striation.

"Relighting a Plant Nursery"

The Question

"I have a client who needs to relight an unconditioned plant nursery. The space is currently lit with 250W HID fixtures - and I was planning to specify HP 1.15 ballast factor ballasts along with 25W 4’ T8 lamps for the retrofit.

Would this solution work in this application?"


The Answer

25W lamps require minimum temps of 60°F at all times in order for their krypton gases to co-mingle with their other gaseous friends in the lamp. If the temperature falls below 60°F (as it likely will in an unconditioned space) the krypton acts like a wall flower at a middle-school dance. It refuses to co-mingle, and striations will occur.

To avoid striations (and the unpleasant visual effects they cause) - I would recommend (4) 32W 4’ T8 lamps at a minimum.

If you’re interested, the attached white paper from Philips ADVANCE provides more in-depth information about the causes of lamp striation that is applicable to lamps from any manufacturer.

Feel free to call or write if you have more questions on this or any other project.

Sincerely,
-------------------------------------------
Joe Martin
Vice President of Engineering
Precision-Paragon [P2]

pdficonDownload The PDF


 

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