A 40watt single aquarium light won't provide the required lighting for vft's, unless it is a bulb not a tube. I grow my tropical droseras 10cm below 2 40watt tubes and they grow well and turn red. Flytraps need a little bit more light and should be kept closer than drosera.
Your plants will do better in full sun outdoors, so I wouldn't even bother with artificial lights.
Not all company grow flytraps in completely artificial conditions. A lot grow them in greenhouses with natural sunlight, so your flytrap may not be out of sync with the seasons.