Have you had yours over 6 months? Time for a change!
As always, DON'T get a coil.
There are UVB guns you can use to measure the amount of UVB a bulb outputs... I can't help with that, because I don't have one but I know many people here do. I'm not sure watts are important to UVB output, unlike heat bulbs? Wattage is the measure of how much (energy, electricity, anyone?) goes into the bulb, and how much it heats up. UVBs don't need to get heated up, so they don't have much wattage.
What wattage you need depends on the size of your enclosure, the ambient room temp and the temperatures you wish to achieve and maintain. If your current bulb is doing the job correctly, I would get one the same size. The wattage will be printed on the bulb.
Ya o no never do a coil no blindness for my torts i want old age to do that not me lol iv had mine for about a month but im not sure what is put out the one i have is heat n uvb 65 watt but i dont know how much is uvb the enclosure is 4 and half foot by 3 foot and my temps are 85 cooler end 98 basking
Phebe. Please use capital letters, punctuation and correct spelling. Your posts are very difficult to read and understand. You will get more and better responses if you slow down a little and proofread. You aren't texting a buddy here, you are asking for help from a wide variety of people of all ages and backgrounds... Call me old-fashioned, but I like to read legible, complete sentences.
There is no 65 watt bulb that puts out any UVB. Do you want to post pics of what all you have got, so we can figure it out? Sounds like you have a simple incandescent flood bulb. This means you will need to get a UV bulb for winter if your tortoises won't be getting regular sunshine. A mercury vapor bulb might be too hot if the 65 watt is maintaining those temps for you.
Ahh. That one does produce UV, but most of us are not familiar with that type. They have only been sporadically available here, and under several names, but they are good. Only a UV meter, like this: https://www.solarmeter.com/model65.html, will tell you if it is still producing good UV. Those last much longer than most indoor UV sources, so you might be just fine.
I'm sorry about my previous reply (erroneous reply). I see after doing a search that it is a metal halide/UV bulb. Yes, you can burn their eyes if you provide too much UV.