Mrs C:
My problem with conventional bulbs has usually been getting hold of a low enough wattage. For example, I find that 40W is too bright for a desk lamp (because of the glare off the page), so (with conventional bulbs) I prefer 25W. It's taken me quite a while to get hold of of a 'long-life' bulb with an equivalent rating. (From memory, I think the bulb currently in my desk lamp is rated as "4W -equivalent to 30W tungsten).
However, I do understand your problem. No light bulbs produce 'true white' light. (The nearest you can get is the tungsten 'daylight' bulbs used by artists. To most people's eyes, the light from these bulbs is very 'clinical'). So the light from different types of bulbs has various colour biases. When scientists measure the 'equivalent light output' of the newer types of bulbs, they're using light meters rather than seeing the light in the same way that the human eye does. For this reason, many people perceive the light from a long-life bulb rated as 'equivalent to 40W' as being less bright than a normal 40W tungsten bulb.
However, the answer is simple. If you used to have a 40W tungsten bulb in your bedside lamp, simply get a long-life bulb rated as 'equivalent to 60W'. Similarly, if you were using a 60W tungsten bulb, look for a long-life bulb rated as 'equivalent to 100W'. You'll still use less electricity with the newer bulbs. You can also disregard any safety labels on the lamps (such as 'do not exceed 60W') because the newer bulbs generate far less heat.
Chris