Glass tank heating

[exoticsandtropics]

hello, does anyone know if it would be safe to put a spot bulb and hold ( exo terra glow lamp with dome) directly on or very near a glass tank. i am getting a load of glass vivs and am wondering what will happen?

do you think it will crack the glass or will it just get hot?

[exoticsandtropics]

anyone have any idea on this?

[Ceratophrys]

prolly crack the glass tbh your better off using heat matts on the side or something

[fixitsan]

What breaks glass is stress, and stress happens when there is a significant temperature difference across the glass or on either side of it.

If you started with a cold bulb and a cold piece of glass then chances are it won't crack but just warm steadily as the bulb warms. To make things even more favourable you could paint a small black square on the back of the glass next to the bulb which will have the effect of absorbing more heat sooner.

Sooner or later though the glass is going to get very hot. I would offset the lamp with a support of some sort to let some air flow around the area.

Just bear in mind that glass never cracks because of heat alone, but because it is heated too quickly. If you can heat it slowly or leave some air space you will not normally have a problem

[animal addict]

I have a glass viv for my baby beardie - so has a spotlight - I dont have any issues with heating (took me a while to get the temps right though in the beginning but probably mainly due to it being small) the bulb isnt resting on the glass but is hanging inside about an inch maybe from the glass and I havent had any problems with it cracking or anything