Artificial lighting

[Guillaume]

Hi, I just installed a 400 watt 6000 k metal halide globe in my orchid house. I mainly have the light sensitive Angreacums. The closest pant is approx. 1.5 meter from the light source. My question: is there any chance of eg UV damage to the plants du to over exposure?

[Magnus A]

Originally Posted by Guillaume

Hi, I just installed a 400 watt 6000 k metal halide globe in my orchid house. I mainly have the light sensitive Angreacums. The closest pant is approx. 1.5 meter from the light source. My question: is there any chance of eg UV damage to the plants du to over exposure?

No, the lamp should have a strong UV-filter in form of the outer glass case. Though if that is broken, you will have severe UV-burns if the inner lamp is not destroyed.

Someone on this or another forum had problems with water hitting a metal halide lamp that made the outer glass burst while the lamp still was functional. Resulting in badly burned orchids.

/M

[DavidCampen]

Originally Posted by Magnus A

...
Someone on this or another forum had problems with water hitting a metal halide lamp that made the outer glass burst while the lamp still was functional. Resulting in badly burned orchids.

/M

http://www.orchidboard.com/community...ulb-fails.html

[Guillaume]

Well in that case - installing the metal halide globe seems like such an easy answer to all my light issues (I hope). I have light hungry Dendrobiums mixed with shade loving Angreacums, and now it seems that I can keep them side by side under the same light intensity(?) PS. thnx for the pics David