Metal Halides and U.V rays

[BlueHeeler]

Is there any danger to the aquarist's arms (working in the tank) from any U.V rays from a metal halide light?

[ILLUSN]

most metal halides have a glass jacket over the bulb (this is built into the bulb) to block the UV light generated.

[BlueHeeler]

So the glass filters out all U.V there is no "stray" rays zapping skin or eyes?

[ILLUSN]

if there was the globe would be pulled off the market.

[Palpatine]

Depends on the globe.

Double ended globes are not shielded. They will give you sunburn, cause cancer and can severely burn your retinas even with just a few seconds of looking at them. This is why pendants come with a piece of UV shielded glass.

Single ended globes are shielded internally.

[ILLUSN]

I've used double ended globes and all mine are shielded.