light will harm or kill them just like too much or not enough water.
try Phalaenopsis (moth orchids) & Paphiopedilum (ladyslippers)
Phals being the longest lasting blooms...they last about 3 months and will rebloom off the old spike therefore your orchid could be in bloom for up to 6 months of the year.
But Deb you got Dendrobiums to rebloom and they require alot of light to rebloom so you should be ok. I shy away from the Cattleyas(crosages orchids) while beautiful and they smell GREAT their bloom only last a few days and they only bloom once a year. Not worth my limited space for this one.
Mal