Is this as good as a tent?

For light, close. For odor and humidity control, no — a tent still contains air, film does not.

Can I use kitchen foil instead?

Not recommended. Crinkled foil creates hot spots that can scorch leaves.

Lighting

Name: Reflective Mylar Film + Foil Tape (50 ft)
Brand: Budometry
SKU: mylar-film
Price: 33 USD
Availability: InStock

Stage: Setup

$33

In an open space, a large share of your light misses the plants entirely and dies on a beige wall. Reflective film sends it back.

Lower and outer bud sites are the ones that suffer first without it, because those sites live almost entirely on reflected light.

2-mil diamond-pattern film diffuses rather than hot-spots, and the foil tape holds seams flat without curling.

Hang Bar + Ceiling Hook Kit (No-Tent Setups)

A solid, height-adjustable place to hang your light when there is no tent frame.

$69

Budometry 480W Full-Spectrum LED

Dimmable quantum board covering a 4x4 tent from seedling through late flower.

$428

Ratchet Light Hanger Pair

Raise and lower your light one click at a time to hold the right height all grow.

$22

Is this as good as a tent?: For light, close. For odor and humidity control, no — a tent still contains air, film does not.
Can I use kitchen foil instead?: Not recommended. Crinkled foil creates hot spots that can scorch leaves.