Hi all, A month or so ago there was a thread that discussed UV-B performance from different lamps and the NEC T-10 was mentioned. I personally have taken an interest in UV-B performance of different lamps and have my own UVB meter from Solarmeter. Since I don't own an NEC T-10 to test myself I promised in teh earlier thread to check that I would ask someone who knew what the performance for this lamp is like. The following extract was written by the author of uvguide.co.uk which is an excellent reference for Herp keepers wanting to know more about UV-B performance from different lamps and how to improve the UV-B exposure you might be offereing your animal. In no way do I want to cast any aspersions towards those using NEC T-10's or the relevance of UV-B to different animals. I know people that use no UV and seem to maintain excellent health in their collections. Instead I've followed this through just so everyone know's what the T-10 is like when compared with more expensive lamps. The extract commences here and is reproduced with the owners permission. They (NEC T10) are old-fashioned blacklights, also I think, once used as UVA tanning lamps, but I don't think they are actually used for tanning any more. The T10 describes just the diameter of the tube (1.5 inches) The one I was sent was 24ins long and has the following designation: NEC T10 Blacklight FL20SBL - 24. They are manufactured in Japan for NEC Pty.Ltd. (http://www.nec.com.au) and they look well made, but not intended for retail sale. There are no instructions for use, or any product information, supplied with the lamp which is packaged in a thin cardboard sleeve. Apart from the word "black light" there is no indication printed on the lamp or on the sleeve that this product even emits UVA or UVB. There are no warning symbols of any sort either. For those of you who haven't seen a blacklight - they look like regular white tubes (as opposed to a purple-black "blacklight-blue" disco tube) and when you switch them on, you see a pale grey-blue dim light. I tested it with all the usual equipment including the Solarmeters and the spectrometer. (I must write the report up properly..) The lamp is emitting an enormous amount of UVA. It is a very powerful UVA lamp - but it is not emitting very much UVB at all. If you are after a lamp for producing a lot of vitamin D3, I'm afraid this one isn't it, however, it will produce just a little bit. Which is why, I guess, they are still used and why they presumably *just* enable a reptile given a good diet with vit D3 in it, to stay apparently free from MBD... With my UVB meter, UV Index meter, and lux meter, I got the following readings: 2" - 57µW/cm² - UV Index 1.2 - 690 lux 4" - 31µW/cm² - UV Index 0.6 - 366 lux 6" - 21µW/cm² - UV Index 0.4 - 253 lux 8" - 15µW/cm² - UV Index 0.3 - 185 lux 10" - 12µW/cm² - UV Index 0.2 - 144 lux 12" - 9µW/cm² - UV Index 0.1 - 117 lux The lamp is not emitting any UVC except within 0.1" of the surface (3 µW/cm² - this is normal for almost all fluorescent tubes) So you can see what we have here is a tube that is only emitting about the same UVB as tubes marketed in the reptile trade for species with very low UVB requirements, usually called "daylight" or "natural light" tubes, typically 2.0 or 2%UVB. However, the tubes actually sold for this purpose typically have a comparatively intense visible light output. This has a very, very poor visible light output. The output from this lamp in the range which will promote vitamin D3 synthesis is very low at reasonable basking distances. At 8 to 12 inches away from the lamps, the UVI is between 0.1 - 0.3, which are typical readings found in heavy shade under trees, close to sunrise or sunset, or in winter under overcast skies. But it also has an extremely high UVA output. I've uploaded a spectrum temporarily here: http://www.uvguide.co.uk/images/NECblacklight-fullUV-visSpectrum.gif If that link breaks try: http://tinyurl.com/3y8ach I don't have a UVA meter to give you comparative figures at different distances. (The spectrum was at 10cm.) But that is a lot of UVA. About half of it - the wavelengths above 350nm - may be visible to reptiles as a "colour" so it may look brighter to them than it does to us.... but I wouldn't count on it. I would certainly be concerned about letting a reptile sit too close to this (in an effort to get more UVB) because UVA can penetrate to the back of the eye, to the retina, so in some ways, huge amounts of UVA shining in the animal's face from a dim lamp (whose brightness doesn't make a reptile look away) could be more hazardous than UVB. A lot of our lamps are rather low in UVA and I suppose this lamp might be useful in some circumstances, *just* to boost UVA, if USED VERY CLOSE TO OTHER LAMPS and not too close to the lizard. With it, you'd need (1) another lamp which could supply intense bright light (to stop reptiles gazing into it) AND (2)for all sun-basking reptiles, you'd need another lamp to supply much better UVB. But on it's own, as a tube for supplying UVB to captive reptiles? No, there are far, far better lamps on the market today than an NEC T10 Blacklight.