With lights in general, reflectors make a big difference. A 180 degree,
semicircular, metal reflector can double the amount of illumination.
And a focused, parabolic, mirror-coated one can make the light even
more intense. But with orchids, which are sensitive to direct light, I
suppose you'd also need a diffuser.

Do you have a light meter? The important thing is to make sure the
orchids are receiving the right illumination for their type. In the
Ortho books "Complete Guide to Orchids," they have one chapter devoted
to light. On page 44, they list ideal light ranges in foot-candles for
most orchids. More illumination isn't always better, so knowing what
the plants need vs. what they're receiving is important.

-Munir