UV LEDs are asked to hold a wavelength, not just a brightness. Heat and water shift both. A flood that was impressive in a showroom and dull two seasons later has usually lost the thermal path or let moisture onto the board. The LED bin is rarely the first thing that moved.
What the ratings on these fixtures mean
IP66 on the 496TG, 296TG, 35TG, 35TG II, 5763TG, the portable work lights and the line light means dust-tight and protected against strong water jets. IP65 on the 5747 family, XYTG and PGTG is dust-tight and protected against water jets. The downlight and the spot are IP20. They belong in a dry ceiling, not on a mast.
The outdoor datasheets list a working range of −40 °C to +40 °C. That is the ambient window, not permission to box the fixture into an unvented soffit. Aluminum housings, and tempered glass on the series that specify it, are there to get heat off the board and keep the optical face stable.
Driver location is a heat decision
An external driver keeps a hot component out of the head and makes the driver replaceable on the pole. An internal driver, as on 5763TG, PGTG and the 5747 family, simplifies the mast wiring. Tell us whether the crew can reach a driver box. We will not hide that choice in a footnote.
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