T5s - To much or too little light for Lepanthes?

[s1214215]

Hi everyone

I have a T5 unit that takes 4 x 54 watt HO tubes. You must run two tubes in tandem for them to turn on as it only has 2 ballasts. I am getting my light tubes today, 2x 4000K and 2 x 6100K tubes.

Would all 4 tubes in a 60cm tall by 75cm wide wardian case be too much light for my Lepanthes Calodictyon - located on the bottom of the case? My other species are Ceratochilus Biglandosus and Psygmorchis Pusilla. - Or should I just use one tube of the 4000K and one of the 6100K - would it be enough for my other orchids if it is all the Lepanthes needs or can take?

The light unit also uses parabolic reflectors to maximise light concentration. I am hunting for a light meter, but no luck so far in Bangkok. I will have to order one in I think

Brett