Yes. The ones I have are marked JA8-2016-E on the bulb.
Thank you for your question. This product has an operating temperature range of -14 to 120 degrees Fahrenheit.
Thank you for your question. Normally lighting in sauna is kept in an enclosed fixture and separate from the ambient temperature of the sauna itself. Please refer to your sauna's specifications regarding it's lighting fixture(s) for details regarding the suggested bulb's type, shape, wattage and voltage.