grow light ballast

Small T5HO combo fixtures commonly list ratings around 24–39 watts for 2‑foot and 3‑foot units. Digital ballasts for high‑intensity bulbs can be rated much higher — listings include examples up to 1000 watts for large HID setups.

Many combo fixtures include a power cord, a jumper plug and both hanging and flat‑surface mounting clips. Several models support daisy‑chaining, with some listings explicitly allowing up to eight fixtures to be powered from a single cord.

Many combos advertise full‑spectrum output with color temperatures clustered around the cool daylight range — commonly near 6400K (examples show 6400K–6500K).

Some digital ballasts provide front‑panel dimming (commonly 100%, 75% and 50%). They also often accept multiple input voltages (120V or 240V) and operate on standard frequencies (50–60 Hz).

Some electronic ballasts list operation in harsher conditions, with minimum start temperatures down to about −20°F in certain listings. Digital units commonly accept 50–60 Hz input and support 120V or 240V power sources.