Another way to cope with added light is to offset the light so that it doesn't bother the chickens by being directly over them. Whether a heat lamp or a broad-spectrum light, it's better not to have it directly over the roost. The reason for this is the aggravation factor, and because if birds get cold and combs are in jeapordy they may not feel the heat and can burnm the combs...
You can also use lower wattage.

You can also use lower wattage.