If the Safil is NOT the same as the Tricolor lamp then ignore the rest but if it is the same OR more importantly has the same construction with the different colour filters the same distance from the bulb i.e. close, then be very careful about exceeding the wattage.
I did, using a 25 W bulb instead of, I think, 15W and it ruined its protection without there being any obvious damage. It must have damaged the filter. The safelight test gave me barely a minute of safety. Not enough.
At the risk of being a dismal Jimmy, I found the Durst recommended rating for the bulb to give out a very poor light for B&W if used at the safe wattage, hence the temptation to increase to 25W and a practically non existent light for colour.
Hardly helpful, I know given you now have the Durst lamp but I have since moved to the Ilford 902 at 15W and found the light intensity to be much better.
pentaxuser