These are all VERY GOOD lamps. A UV Index of 3-4 is what the World Health Organisation calls "moderate" and is what you get in full tropical or subtropical sun from about 8.30 - 9.30 in the morning or 2.30 - 3.30 in the afternoon, or in light shade, or in overcast weather at mid-day.puppytoes72":2scy8udr said:I found 3 spare T-Rex ActiveUV bulbs in Jojo's cabinet and I tested those.I never throw her old bulbs away. They have all had about 6 months of use.
Bulb#1
UVI 4.1 14'' away
Bulb#2
UVI 3.0 14"away
Bulb#3
UVI 4.7 14'' away
Another VERY GOOD LAMP.Next,the old T-Rex ActiveUV,which she has happily been basking under.*ONE YEAR USE*.
UVI 3.8 14'' away
I don't like this, Michelle.First,the BRAND NEW T-Rex Economy,(the one that I was worried about because after 2 days Jojo was closing her eye and wouldn't open it until I put her old bulb back in.) It has had almost 100 hours of burn time.
UVI 8.5 12'' from the "eye" of the sensor to the face of the bulb.
6.3 14''
*I don't know why Jojo acted like this was too strong, because in her viv set-up she is about 18'' away* Frances,do you think this is safe to use? Can I assume there are no harmful/shortwave rays??
Perfect. That's exactly what you always get with mercury vapor lamps. The centre of the beam is usually quite tiny, with a sharp gradient either side.One thing I noticed is that a 1/2 inch in either direction changed the result drastically.It took time to find the highest reading on each bulb. I held my hand steady on the floor w/ the sensor facing upwards to the bulb and I basically moved my hand around until I found the highest reading (which I guess would be the center of the beam)
So how did I do Frances?
Hi, Dawn - I must get your good lamp in the mail back to you.gulfbrzdawn":2scy8udr said:I thought surely it's not the Solar Glo, since Frances tested the bulbs I sent her and the 125W Solar was emitting good levels of uvb. I am starting to think no two bulbs are created equal, even if from the same manufacturer. It is quite puzzling, to say the least.
Hi, Tracie.Drache613":2scy8udr said:I have one coming in a week or so, finally. I just decided it was too important with all of the bulb problems.
To measure the Total UVB, you need a Solarmeter 6.2. These readings are often quite surprisingly low with problem bulbs, which is why the problem often goes undetected. The very short wavelength rays are so strong, you don't need a lot of them to cause harm. But they give a powerful UVI reading on the 6.5 meter... sooo, if you have both meters and notice a high UVI reading but a comparatively low Total UVB reading, alarm bells ring...Drache613":2scy8udr said:Do you know what the uW/cm2 was reading? That is the amount of UVB that it is putting out. Did you measure that also?
Tracie's right, they won't stay out long with UVI "very high", which is UVI 8 or above, according to the W.H.O.Drache613":2scy8udr said:If the UVI is no higher than 6-8, or 9 at a 12 inch distance that should be "safe" as long as there is no short wave frequency being put out.
I can't remember the exact readings of what bearded dragons prefer to bask but I know in the wild they don't bask for long periods of time under direct noonday sun with the UVI being higher than 10, they head for cover.
You can say that again! :silent:Drache613":2scy8udr said:Sorry this year has been a total bummer for lighting.
puppytoes72":1sq1qq6b said:Is there a chart to show what each UVI means?
puppytoes72":1sq1qq6b said:So basically with my Solarmeter 6.5 if it shows a good UVI reading then it's safe to assume there are NO harmful short wavelength rays??
How do I find out the balance of short:long wavelength uvb?
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