Hi,
the Mars unit does not deliver very good results for the energy consumption.
They are cheap units so people buy them I suppose but their led's are less efficient than the spider farmer and will burn out faster. So essentially you will buy two of them in the long run and still not get as good results.
Don't go that route. You should not be thinking how cheap can I go. You should be thinking what will be most energy efficient to cost me least amount of electricity in a year and provide the best results.
So for orchids that would include the Arcadia Jungle Dawn LED.
I do not live in Portugal so have no idea where you would source it but I'm sure some reptile suppliers around you will have them.
All I can offer is a link through amazon.de which will probably be more expensive than you should be able to find.
If you think it is expensive, realize you will get 50% more growth than from an inefficient unit and the unit will run twice as long before it needs replacing so is it expensive or is it a good investment that works out cheaper in the long run.
Arcadia Jungle Dawn LED Bar (15 W - 290 mm): Amazon.de: Haustier
Hybrid Mode
