Bloom Plus XP4000 Review: What My 2022 PPFD Test Found

Short answer: the Bloom Plus XP4000 I tested in 2022 delivered a much more even footprint than the weak fixture it replaced. At 18 inches, I recorded roughly 900 µmol/m²/s toward the outside and a little over 1,000 in the center. That was an encouraging result for this exact historical unit, not a permanent recommendation for every Bloom Plus model.

Video chapters

1. 0:00 — Why I replaced the previous light
2. 0:14 — Panel and diode layout
3. 0:31 — LED count in the tested unit
4. 0:45 — Wiring and connectors
5. 1:04 — Two-driver configuration
6. 1:19 — Dimmer and included hardware
7. 1:40 — Four-point hanging
8. 1:59 — Outer reading at 18 inches
9. 2:15 — Center reading and uniformity
10. 2:27 — Edge-biased diode spacing
11. 2:40 — Heat impression and old verdict

Timestamp links open the standard HWGrow pop-out player at the selected moment without taking you away from your reading position.

Why the footprint impressed me

The important result was not the center being a little over 1,000. It was the outside reading near 900 at the same 18-inch height. That smaller center-to-edge gap suggested a more useful canopy than the narrow hotspot I had just rejected.

The board layout appeared denser near the edges, which is a sensible way to fight falloff. I also liked the 0–100% dimmer and the thin form factor. I still used four rope hangers because four adjustable corners make a wide fixture easier to level than the two wires and two hangers included with the unit.

Two corrections to the original recording

Samsung’s lighting catalog shows multiple LED families and specifications; it does not authenticate a finished marketplace fixture. The FTC’s advertising guidance explains why objective performance claims should be evidence-based.

Use the current LED selection guide for grid measurements and the equipment-generation guide before using this old positive review as a buying decision.

Useful setup and verification tools

Current LED light categoryCompare the exact generation, full map, wall draw and warranty.Check Current Options
Plug-in power meterVerify actual draw at each dimmer setting.Check Current Price
Four-point rope hangersLevel the fixture and repeat a measured hanging height.Check Current Price

Affiliate disclosure: HWGrow may earn a commission from qualifying Amazon purchases at no additional cost to you. Equivalent current items can replace these links without changing the testing workflow.

Frequently asked questions

Was the Bloom Plus XP4000 good in HWGrow’s test?

Yes, the tested 2022 unit produced an encouragingly even center-to-edge result at 18 inches. That does not verify a different production run or current model.

Did HWGrow verify the LM301H diodes?

No. The recording discusses the listing and visible package, but component authentication was not performed.

Does a thin LED panel create less room heat?

Not necessarily. Compare measured wall draw and the whole-room heat load rather than judging only by how hot the panel feels.

How many hangers should a wide fixture use?

Four adjustable corners provide better leveling and height control, provided the tent structure and hangers are rated for the load.