Nebula Mars 3 Air
#50 in 1080p and underFull review
A battery projector for backyard movies and camping that delivers its rated brightness. Newer rivals cost less for similar output.
Amazon $519.99$519.99
The Nebula Mars 3 Air and the HAPPRUN 510G are evenly matched, rated 3.3 and 3.2. The Nebula Mars 3 Air leads on setup. The HAPPRUN 510G wins on value and resolution. The HAPPRUN 510G costs $270 less ($249.99 vs $519.99).
HAPPRUN 510G
#52 in 1080p and underFull review
A low cost Google TV projector for a dark room, for buyers who want licensed Netflix without a stick. Setup is manual and the speaker is weak.
Amazon $249.99$249.99
Prices were last checked October 29, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Nebula Mars 3 Air for setup (Autofocus, auto keystone vs Manual focus and keystone).
- Choose the HAPPRUN 510G for value ($0.62 per lumen vs $1.30 per lumen) and resolution (1920 x 1080 native vs 960 x 540 native, pixel shift to 1080p).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 1080p and under projector; a clear win is highlighted. How we rank explains each one.
| Factor weight | Nebula Mars 3 Air | HAPPRUN 510G |
|---|---|---|
| Overall rating | 3.3/5 | 3.2/5 |
| Brightness 25% | 31 400 ANSI lumens | 31 400 ANSI lumens |
| Value 15% | 0 $1.30 per lumen | 44 $0.62 per lumen |
| Resolution 10% | 70 960 x 540 native, pixel shift to 1080p | 100 1920 x 1080 native |
| Streaming 15% | 100 Google TV with licensed Netflix | 100 Google TV with licensed Netflix |
| Setup 10% | 60 Autofocus, auto keystone | 0 Manual focus and keystone |
| Light life 10% | 100 30,000 hour LED | 50 light source life not published (neutral score used) |
| Gaming 10% | 50 input lag not published (neutral score used) | 50 input lag not published (neutral score used) |
| Warranty 5% | 0 1-year warranty | 0 1-year warranty |
Independent measurements
Nebula Mars 3 Air
| Tested by | Brightness | Input lag | Contrast | Conditions |
|---|---|---|---|---|
| ProjectorCentral | 399 lm | 44.1 ms | - | Maximum in Conference mode, which is very green; Movie mode measured 372 ANSI lumens. Lag at 1080p/60. |
HAPPRUN 510G
No independent test published yet.
Specifications
| Nebula Mars 3 Air | HAPPRUN 510G | |
|---|---|---|
| Picture | ||
| Brightness | 400 ANSI | 400 ANSI |
| Native resolution | 960 x 540 | 1920 x 1080 (1080p) |
| Picture resolution | 1080p (pixel shift from 960 x 540) | 1080p |
| Display | DLP | LCD |
| Light source | LED | LED |
| Light source life | 30,000 hours | - |
| HDR | - | HDR10 |
| Native contrast | 400:1 | - |
| Placement | ||
| Throw | Standard throw (1.2:1) | Standard throw |
| Largest image | 150 in | 300 in |
| Autofocus | Yes | No |
| Auto keystone | Yes | No |
| Obstacle avoidance | Yes | - |
| Auto screen fit | Yes | - |
| Optical zoom | None | - |
| Streaming and gaming | ||
| Built-in apps | Google TV, licensed Netflix | Google TV, licensed Netflix |
| Top refresh rate | 60 Hz | - |
| HDMI ports | 1 | 1 |
| eARC | No | - |
| Speakers | 16 W | 5 W |
| Build | ||
| Battery | 2.5 hours | None |
| Fan noise | 28 dB | - |
| Power | 90 W | - |
| Dimensions | 7.01 x 4.8 x 5.24 in | 240 x 210 x 96 mm |
| Weight | 3.7 lb | 3.5 lb |
| Warranty | 1 years | 1 years |
| Released | 2023-11 | 2025-09 |