om LED fra andre kilder

Synspunkter på aldring og levetid for LED : 

The Risks of LED Lighting Technology – Part I

The Risks of LED Lighting Technology – Part II

http://www.greenhousegrower.com/structures-equipment/tips-for-cherry-picking-the-right-led-lighting-solution-for-your-greenhouse/

http://www.greenhousegrower.com/structures-equipment/customizing-crop-foliage-color-with-leds-ornamental-crops/