I was thinking that one day I may want to set up a cactus/succulent terrarium ( eventhough I can find the reason why I need one) , started to think of the design and setup.
I went through this thread to understand further on the light requirements & specs, find it so difficult to judge by the printed lumens value on the box, then adjusting the light further up and down. When I buy bulbs at store, whenever possible I will use lux meter in mobile phone to measure the lumens. This make me dig further that there is a PPFD/PAR and DLI measurement for plants.
Found the application, not knowing how accurate it is, but it is interesting to play with.
I measure the light at 6 am in the morning. The rising sun.
Outdoor under a tree/shade
Outdoor no shade and no sun
Outdoor with direct sun at 6 am
Those figures may not be accurate at all, but at least we have some figures and benchmark to measure the brightness of the light.
Another area is that I find a lot of PPFD standard requirements for various type of plants, but can not find any information about PPFD requirements for cactus or succulents, would appreciate if any of have those information and can share it here
