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We went to the Heine blades several years ago. Before that we had incandescent and Welch Allen fibreoptic blades in the O/R's. Some problems that developed with the Heine blades was a breakage of the material transmitting the light, causing some serious decreases in light. Whether it was our cleaning techniques or a design flaw I cannot say, but the blades were replaced and we haven't had problems since.
There are several concerns with the traditional incandescent bulbs that led many to go to fibreoptic. One is the obvious fact that the bulb can and have fallen off during crucial times. It pays to really check the equipment before you need it. Also, the connection between the bulb and the blade can allow for a buildup of cruddy stuff and some bulbs have grooves for better grip, which also can be hard to clean.
This being said, I like to keep the old incandescent blades around since I have found a consistently bright light from them. I find that although the fibreoptics can give a bright light, its too varied to rely on when you need it most. I had a debate about this the other day with a diehard fibreoptic user. We did a random selection of the blades in the ICU, and the incandescent won out.
Depending on the usage, you may benefit from disposable handles and blades that are available as well. Certain scenes can be gory and I have seen some less than complete cleaning jobs available to those in the field. Just a suggestion.