I bought these to use in the Scentsy and Scentsational wax heaters, but they don't get hot enough to melt the wax. They're the right size for a heating pad and 25 watts like the original bulbs, but barely get hot enough to soften the side of the wax cube that's touching the heating pad, rather than thinning the wax as desired. They are well packaged and I haven't noticed any broken ones so far (of the 4 bulbs I opened). They don't last very long, I used two bulbs in one heater for 1 month! I thought it might be a problem with the heater itself, but I've swapped out the bulbs for another heater and it still doesn't heat up enough and burns out very quickly!